{"id":18802,"date":"2025-07-08T12:40:46","date_gmt":"2025-07-08T15:40:46","guid":{"rendered":"https:\/\/biologo.com.br\/bio\/?p=18802"},"modified":"2025-07-09T08:48:28","modified_gmt":"2025-07-09T11:48:28","slug":"os-ultimos-gigantes-o-colapso-da-megafauna","status":"publish","type":"post","link":"https:\/\/biologo.com.br\/bio\/os-ultimos-gigantes-o-colapso-da-megafauna\/","title":{"rendered":"Os \u00daltimos Gigantes"},"content":{"rendered":"\n<p><span style=\"\"><span style=\"color: rgb(0, 0, 0); font-size: 14pt;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"\"><span style=\"color: rgb(0, 0, 0); font-size: 14pt;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"\"><span style=\"color: rgb(0, 0, 0); font-size: 14pt;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><strong><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"color: #3366ff;\"><strong><strong>Os \u00daltimos Gigantes:<\/strong><\/strong><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/strong><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> <span style=\"\"><span style=\"color: rgb(0, 0, 0); font-size: 14pt;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\"><span style=\"font-size: 14pt; color: #000000;\">entre 50 mil e 10 mil anos atr\u00e1s, mais de 70% dos grandes mam\u00edferos \u2014 como mamutes, pregui\u00e7as-gigantes e tigres-dente-de-sabre \u2014 foram extintos em todo o mundo. A a\u00e7\u00e3o humana &nbsp;pr\u00e9-hist\u00f3rica \u00e9 tida como uma das principais causas para tal decl\u00ednio.<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n\n\n\n<figure class=\"wp-block-image alignright size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"74\" height=\"83\" data-attachment-id=\"18164\" data-permalink=\"https:\/\/biologo.com.br\/bio\/sylvia-earle-na-luta-pelos-oceanos\/original-biologo-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/05\/original-biologo-2.jpg?fit=74%2C83&amp;ssl=1\" data-orig-size=\"74,83\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"original-biologo (2)\" data-image-description=\"&lt;p&gt;artigo original www.biologo.com.br \u00a9 todos os direitos reservados&lt;\/p&gt;\n\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/05\/original-biologo-2.jpg?fit=74%2C83&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/05\/original-biologo-2.jpg?resize=74%2C83&#038;ssl=1\" alt=\"Artigo original www.biologo.com.br \u00a9 todos os direitos reservados\" class=\"wp-image-18164\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span style=\"font-family: 'courier new', courier, monospace; color: #000000; font-size: 24pt;\"><strong><strong><strong><strong><span style=\"font-family: 'courier new', courier, monospace; color: #000000; font-size: 24pt;\"><strong><strong><strong><strong><strong><strong>Os \u00daltimos Gigantes<\/strong><\/strong>:<span style=\"font-family: 'courier new', courier, monospace; color: #000000; font-size: 24pt;\"><strong><strong><strong><strong><span style=\"font-family: 'courier new', courier, monospace; color: #000000; font-size: 24pt;\"><strong><span style=\"font-family: 'courier new', courier, monospace; color: #000000;\"><strong><span style=\"font-size: 24pt;\"><span style=\"font-size: 12pt;\"><strong><strong> o colapso da megafauna e a chegada do\u00a0<em>Homo sapiens<\/em><\/strong><\/strong><\/span><\/span><\/strong><\/span><\/strong><\/span><\/strong><\/strong><\/strong><\/strong><\/span><\/strong><\/strong><\/strong><\/strong><\/span><\/strong><\/strong><\/strong><\/strong><\/span><\/h2>\n\n\n\n<p class=\"has-small-font-size\"><strong>8\/7\/2025<\/strong>&nbsp;::&nbsp; por<strong> Marco Pozzana<\/strong>, bi\u00f3logo<\/p>\n\n\n\n<p class=\"has-drop-cap has-black-color has-text-color has-link-color has-medium-font-size wp-elements-1757b5c4f180dc993a2eb47746f27d07\">Ao final do Pleistoceno, o planeta era um palco de colossos. Mamutes, pregui\u00e7as gigantes, gliptodontes, diprotodontes e outros tit\u00e3s percorriam terras vastas e selvagens. Contudo, em poucos milhares de anos, a maioria dessas esp\u00e9cies desapareceu. O fen\u00f4meno, conhecido como&nbsp;<strong>extin\u00e7\u00e3o da megafauna<\/strong>, ainda intriga a ci\u00eancia. Embora m\u00faltiplos fatores estejam em jogo, a chegada do&nbsp;<em>Homo sapiens<\/em>&nbsp;figura como elemento central nesse colapso ecol\u00f3gico global.<\/p>\n\n\n\n<figure class=\"wp-block-image alignright size-full\"><a href=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/preguica-gigante-peq.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"95\" height=\"133\" data-attachment-id=\"18781\" data-permalink=\"https:\/\/biologo.com.br\/bio\/preguica-gigante-peq\/\" data-orig-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/preguica-gigante-peq.jpg?fit=95%2C133&amp;ssl=1\" data-orig-size=\"95,133\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"preguica-gigante-peq\" data-image-description=\"&lt;p&gt;As pregui\u00e7as-gigantes ou pregui\u00e7as-terr\u00edcolas s\u00e3o um grupo de mam\u00edferos pr\u00e9-hist\u00f3ricos que habitaram as Am\u00e9ricas. Cientificamente s\u00e3o classificados dentro da superordem Xenarthra e relacionados com as pregui\u00e7as atuais, que s\u00e3o arbor\u00edcolas. O grupo \u00e9 constitu\u00eddo por seis fam\u00edlias e 88 g\u00e9neros, todos extintos&lt;\/p&gt;\n\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/preguica-gigante-peq.jpg?fit=95%2C133&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/preguica-gigante-peq.jpg?resize=95%2C133&#038;ssl=1\" alt=\"Os \u00daltimos Gigantes: o colapso da megafauna e a chegada do\u00a0Homo sapiens\" class=\"wp-image-18781\"\/><\/a><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><a href=\"http:\/\/biologo.com.br\/bio?action=user_content_redirect&amp;uuid=f56cffc2ef26fd5fe5b20d7b4a78ce615b06781640ebf6b1c94b5d240e1238cd&amp;blog_id=100478725&amp;post_id=18706&amp;user_id=2588837&amp;subs_id=10180374&amp;signature=d4ea099980298d1551064c83148a2bb6&amp;email_name=new-post&amp;user_email=pozzana@gmail.com&amp;encoded_url=aHR0cHM6Ly9iaW9sb2dvLmNvbS5ici9iaW8vdGVycmEtZG9zLWdpZ2FudGVzLWVjb3MtZGUtdW0tbXVuZG8tcGVyZGlkby8&amp;email_id=e08eb33ed15504265344bbc3f319f180\" target=\"_blank\" rel=\"noreferrer noopener\">Terra dos gigantes: ecos de um mundo perdido<\/a><\/li>\n\n\n\n<li class=\"has-medium-font-size\"><a href=\"http:\/\/biologo.com.br\/bio?action=user_content_redirect&amp;uuid=03f4118402736f7d234eb484513208090ff77140e03b61af4535da6ccdfaba91&amp;blog_id=100478725&amp;post_id=18706&amp;user_id=2588837&amp;subs_id=10180374&amp;signature=893c40405d420e2ccdbbb1ceeb563b96&amp;email_name=new-post&amp;user_email=pozzana@gmail.com&amp;encoded_url=aHR0cHM6Ly9iaW9sb2dvLmNvbS5ici9iaW8vYW50YS1hLWphcmRpbmVpcmEtZGEtZmxvcmVzdGEv&amp;email_id=e08eb33ed15504265344bbc3f319f180\" target=\"_blank\" rel=\"noreferrer noopener\">Anta, a jardineira da floresta<\/a><\/li>\n\n\n\n<li class=\"has-medium-font-size\"><a href=\"http:\/\/biologo.com.br\/bio?action=user_content_redirect&amp;uuid=84966ea1a68949fc0230d62967bdb0f91728bce031c8784b7238e0a473fd0962&amp;blog_id=100478725&amp;post_id=18706&amp;user_id=2588837&amp;subs_id=10180374&amp;signature=903c7a725b32801b636426e394da5c1a&amp;email_name=new-post&amp;user_email=pozzana@gmail.com&amp;encoded_url=aHR0cHM6Ly9iaW9sb2dvLmNvbS5ici9iaW8vbW9hLw=&amp;email_id=e08eb33ed15504265344bbc3f319f180\" target=\"_blank\" rel=\"noreferrer noopener\">Moa,&nbsp;grandes aves sem asas<\/a><\/li>\n\n\n\n<li class=\"has-medium-font-size\"><a href=\"http:\/\/biologo.com.br\/bio?action=user_content_redirect&amp;uuid=19341dbe85cd5a1119cfd5dd36804507b4a7c71b2d728a98e0e7f2c5aa1b0420&amp;blog_id=100478725&amp;post_id=18706&amp;user_id=2588837&amp;subs_id=10180374&amp;signature=2437ccf771897f88e7858fe6293c9320&amp;email_name=new-post&amp;user_email=pozzana@gmail.com&amp;encoded_url=aHR0cHM6Ly9iaW9sb2dvLmNvbS5ici9iaW8vYW5pbWFpcy1leHRpbnRvcy1wZWxvLWhvbWVtLw=&amp;email_id=e08eb33ed15504265344bbc3f319f180\" target=\"_blank\" rel=\"noreferrer noopener\">Animais extintos pelo homem<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-0a36d0a70c4eff1c4137f35f4df6b15e\">De fato, os estudos apontam que as extin\u00e7\u00f5es em massa da megafauna ocorreram quase simultaneamente \u00e0 expans\u00e3o dos humanos modernos por diversos continentes. Na Austr\u00e1lia, por exemplo, quase 90% das grandes esp\u00e9cies desapareceram pouco depois da chegada humana, h\u00e1 cerca de 50 mil anos (Wroe et al., 2013). De modo semelhante, na Am\u00e9rica do Sul, pregui\u00e7as gigantes e toxodontes sumiram ap\u00f3s a entrada dos primeiros povos, h\u00e1 cerca de 13 mil anos (Dillehay et al., 2008).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/toxodonte-Toxodon-platensis.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" data-attachment-id=\"18786\" data-permalink=\"https:\/\/biologo.com.br\/bio\/toxodonte-toxodon-platensis\/\" data-orig-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/toxodonte-Toxodon-platensis.jpg?fit=1200%2C675&amp;ssl=1\" data-orig-size=\"1200,675\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"toxodonte-Toxodon platensis\" data-image-description=\"&lt;p&gt;O toxodonte (Toxodon platensis) habitou a Argentina, Uruguai, Paraguai, Bol\u00edvia e Brasil do final do Plioceno at\u00e9 \u00e9poca relativamente recente. Toxodon significa &amp;#8220;dente em arco&amp;#8221; e platensis provavelmente relacionado a Plata, da Argentina. Seus f\u00f3sseis j\u00e1 foram encontrados em associa\u00e7\u00e3o com pontas de flechas, o que indica que sua extin\u00e7\u00e3o pode estar relacionada \u00e0 ca\u00e7a movida pelos primeiros ind\u00edgenas da Am\u00e9rica do Sul.&lt;\/p&gt;\n\" data-image-caption=\"&lt;p&gt;O toxodonte (Toxodon platensis) habitou a Argentina, Uruguai, Paraguai, Bol\u00edvia e Brasil do final do Plioceno at\u00e9 \u00e9poca relativamente recente. Toxodon significa &amp;#8220;dente em arco&amp;#8221; e platensis provavelmente relacionado a Plata, da Argentina. Seus f\u00f3sseis j\u00e1 foram encontrados em associa\u00e7\u00e3o com pontas de flechas, o que indica que sua extin\u00e7\u00e3o pode estar relacionada \u00e0 ca\u00e7a movida pelos primeiros ind\u00edgenas da Am\u00e9rica do Sul.&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/toxodonte-Toxodon-platensis.jpg?fit=800%2C450&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/toxodonte-Toxodon-platensis.jpg?resize=800%2C450&#038;ssl=1\" alt=\"O toxodonte (Toxodon platensis)\" class=\"wp-image-18786\" srcset=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/toxodonte-Toxodon-platensis.jpg?resize=1024%2C576&amp;ssl=1 1024w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/toxodonte-Toxodon-platensis.jpg?resize=300%2C169&amp;ssl=1 300w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/toxodonte-Toxodon-platensis.jpg?resize=768%2C432&amp;ssl=1 768w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/toxodonte-Toxodon-platensis.jpg?resize=150%2C84&amp;ssl=1 150w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/toxodonte-Toxodon-platensis.jpg?w=1200&amp;ssl=1 1200w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><figcaption class=\"wp-element-caption\">O toxodonte (Toxodon platensis) habitou a Argentina, Uruguai, Paraguai, Bol\u00edvia e Brasil. Seus f\u00f3sseis j\u00e1 foram encontrados em associa\u00e7\u00e3o com pontas de flechas, o que indica que sua extin\u00e7\u00e3o pode estar relacionada \u00e0 ca\u00e7a movida pelos primeiros ind\u00edgenas da Am\u00e9rica do Sul.<\/figcaption><\/figure>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-14176577c5cbf3c21931256d745e47b3\">Embora o clima tenha mudado no final do Pleistoceno, transi\u00e7\u00f5es semelhantes em per\u00edodos anteriores n\u00e3o causaram extin\u00e7\u00f5es t\u00e3o dr\u00e1sticas. Assim, muitos estudiosos defendem que os humanos, como predadores altamente eficientes, romperam equil\u00edbrios antigos. Armados com tecnologia, linguagem e organiza\u00e7\u00e3o social, nossos ancestrais impuseram uma nova e letal press\u00e3o seletiva. N\u00e3o apenas ca\u00e7avam, mas alteravam paisagens com fogo e introduziam novas formas de competi\u00e7\u00e3o.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/megafauna-mamiferos.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" data-attachment-id=\"18784\" data-permalink=\"https:\/\/biologo.com.br\/bio\/megafauna-mamiferos\/\" data-orig-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/megafauna-mamiferos.jpg?fit=1200%2C675&amp;ssl=1\" data-orig-size=\"1200,675\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"megafauna-mamiferos\" data-image-description=\"&lt;p&gt;Os \u00daltimos Gigantes: entre 50 mil e 10 mil anos atr\u00e1s, mais de 70% dos grandes mam\u00edferos \u2014 como mamutes, pregui\u00e7as-gigantes e tigres-dente-de-sabre \u2014 foram extintos em todo o mundo. A a\u00e7\u00e3o humana \u00a0pr\u00e9-hist\u00f3rica \u00e9 tida como uma das principais causas para tal decl\u00ednio.&lt;\/p&gt;\n\" data-image-caption=\"&lt;p&gt;Entre os animais vivos, o termo megafauna \u00e9 mais comumente usado para os maiores mam\u00edferos terrestres existentes , que incluem (mas n\u00e3o est\u00e3o limitados a) elefantes , girafas , hipop\u00f3tamos , rinocerontes e bovinos maiores.&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/megafauna-mamiferos.jpg?fit=800%2C450&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/megafauna-mamiferos.jpg?resize=800%2C450&#038;ssl=1\" alt=\"Megafauna - Mam\u00edferos - Os \u00daltimos Gigantes: o colapso da megafauna e a chegada do Homo sapiens\" class=\"wp-image-18784\" srcset=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/megafauna-mamiferos.jpg?resize=1024%2C576&amp;ssl=1 1024w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/megafauna-mamiferos.jpg?resize=300%2C169&amp;ssl=1 300w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/megafauna-mamiferos.jpg?resize=768%2C432&amp;ssl=1 768w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/megafauna-mamiferos.jpg?resize=150%2C84&amp;ssl=1 150w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/megafauna-mamiferos.jpg?w=1200&amp;ssl=1 1200w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><\/figure>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-9a217304aff882f8bf7ba38a724cb916\">Ademais, a extin\u00e7\u00e3o n\u00e3o foi uniforme. Em ilhas oce\u00e2nicas, onde megafaunas sobreviveram por mais tempo, como em <a href=\"https:\/\/biologo.com.br\/bio\/madagascar-uma-biodiversidade-peculiar\/\"><span style=\"text-decoration: underline;\">Madagascar<\/span><\/a> e <a href=\"https:\/\/biologo.com.br\/bio\/nova-zelandia-primitiva\/\"><span style=\"text-decoration: underline;\">Nova Zel\u00e2ndia<\/span><\/a>, as perdas ocorreram mil\u00eanios ap\u00f3s a chegada humana. Isso refor\u00e7a a hip\u00f3tese de que a presen\u00e7a humana foi um gatilho prim\u00e1rio (Boivin et al., 2016). Ainda que eventos clim\u00e1ticos tivessem papel coadjuvante, eles n\u00e3o explicam sozinhos a sincronia global das extin\u00e7\u00f5es.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\">T\u00famulos de Ossos: vest\u00edgios da megafauna em um mundo transformado<\/h3>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-105c8b12646f29db357c4f65105a7ac3\">No caso da Am\u00e9rica do Norte, o desaparecimento quase simult\u00e2neo de mamutes, mastodontes, cavalos e camelos coincidiu com a cultura Cl\u00f3vis, conhecida por suas sofisticadas pontas de lan\u00e7a (Faith &amp; Surovell, 2009). A ca\u00e7a excessiva, nesse contexto, parece n\u00e3o ter sido espor\u00e1dica, mas sistem\u00e1tica. Mesmo em regi\u00f5es onde a megafauna era abundante, a press\u00e3o humana rapidamente reduziu popula\u00e7\u00f5es at\u00e9 um ponto irrevers\u00edvel.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/preguica-gigante.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" data-attachment-id=\"18785\" data-permalink=\"https:\/\/biologo.com.br\/bio\/preguica-gigante\/\" data-orig-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/preguica-gigante.jpg?fit=1200%2C675&amp;ssl=1\" data-orig-size=\"1200,675\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"pregui\u00e7a-gigante\" data-image-description=\"&lt;p&gt;As pregui\u00e7as-gigantes ou pregui\u00e7as-terr\u00edcolas s\u00e3o um grupo de mam\u00edferos pr\u00e9-hist\u00f3ricos que habitaram as Am\u00e9ricas. Cientificamente s\u00e3o classificados dentro da superordem Xenarthra e relacionados com as pregui\u00e7as atuais, que s\u00e3o arbor\u00edcolas. O grupo \u00e9 constitu\u00eddo por seis fam\u00edlias e 88 g\u00eaneros, todos extintos&lt;\/p&gt;\n\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/preguica-gigante.jpg?fit=800%2C450&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/preguica-gigante.jpg?resize=800%2C450&#038;ssl=1\" alt=\"Pregui\u00e7a-gigante\" class=\"wp-image-18785\" srcset=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/preguica-gigante.jpg?resize=1024%2C576&amp;ssl=1 1024w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/preguica-gigante.jpg?resize=300%2C169&amp;ssl=1 300w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/preguica-gigante.jpg?resize=768%2C432&amp;ssl=1 768w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/preguica-gigante.jpg?resize=150%2C84&amp;ssl=1 150w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/preguica-gigante.jpg?w=1200&amp;ssl=1 1200w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><figcaption class=\"wp-element-caption\">As pregui\u00e7as-gigantes s\u00e3o um grupo de mam\u00edferos pr\u00e9-hist\u00f3ricos que habitaram as Am\u00e9ricas. S\u00e3o classificados dentro da superordem Xenarthra e relacionados com as pregui\u00e7as atuais, arbor\u00edcolas<\/figcaption><\/figure>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-3d411c59aed9935df3c199b49d3bfefe\">Contudo, nem todos os pesquisadores concordam com a teoria da superca\u00e7a. Alguns sugerem que os gigantes j\u00e1 enfrentavam desafios devido ao aquecimento p\u00f3s-glacial. Al\u00e9m disso, modelos clim\u00e1ticos indicam secas e mudan\u00e7as abruptas nos biomas. No entanto, popula\u00e7\u00f5es resilientes por milhares de anos sucumbiram justamente ap\u00f3s a chegada humana. Essa coincid\u00eancia temporal, portanto, \u00e9 dif\u00edcil de ignorar.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-27b4901ee887c940cd10796b477fd328\">Outros ind\u00edcios refor\u00e7am essa associa\u00e7\u00e3o. Na Sib\u00e9ria, por exemplo, restos de mamutes mostram marcas claras de abate. Ossos partidos, ferramentas associadas e at\u00e9 armadilhas escavadas indicam a\u00e7\u00e3o deliberada (Pitulko et al., 2004). Em suma, os humanos n\u00e3o apenas se adaptaram ao novo ambiente \u2014 eles o transformaram profundamente.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-5a5c51a65fb4a70bb39ea0c407865812\">Al\u00e9m disso, o desaparecimento da megafauna teve consequ\u00eancias ecol\u00f3gicas duradouras. Sem grandes herb\u00edvoros, florestas densas substitu\u00edram pastagens abertas. Ciclos de nutrientes se alteraram. Predadores que dependiam desses grandes animais, como o tigre-dente-de-sabre, tamb\u00e9m foram extintos. Dessa forma, o colapso n\u00e3o afetou apenas as esp\u00e9cies diretamente ca\u00e7adas, mas toda a teia tr\u00f3fica.<\/p>\n\n\n\n<h5 class=\"wp-block-heading has-black-color has-text-color has-link-color has-medium-font-size wp-elements-1d92ef037e7d2006fd6d4fe98e9dc9a2\">As Pegadas que Restaram: mem\u00f3rias f\u00f3sseis de um mundo colossal<\/h5>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-8d6b6a85cf165ee328d5f299b3155f1b\">Nesse sentido, a extin\u00e7\u00e3o da megafauna representa uma das primeiras grandes interven\u00e7\u00f5es humanas no planeta. E, ainda mais importante, ela antecipa padr\u00f5es de impacto que se repetiriam ao longo da hist\u00f3ria: explora\u00e7\u00e3o intensa, altera\u00e7\u00f5es ambientais e perdas em cascata. A chegada do <em>Homo sapiens<\/em> inaugurou, assim, uma nova era ecol\u00f3gica.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/diprotodonte.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" data-attachment-id=\"18787\" data-permalink=\"https:\/\/biologo.com.br\/bio\/diprotodonte\/\" data-orig-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/diprotodonte.jpg?fit=1200%2C675&amp;ssl=1\" data-orig-size=\"1200,675\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"diprotodonte\" data-image-description=\"&lt;p&gt;O diprotodonte (g\u00eanero Diprotodon), tamb\u00e9m conhecido como vombate-gigante, foi um marsupial pr\u00e9-hist\u00f3rico australiano parente do vombate, s\u00f3 que muito maior. De fato, ele chegava ao tamanho de um rinoceronte e foi o maior marsupial que j\u00e1 viveu. Os \u00daltimos Gigantes: o colapso da megafauna e a chegada do\u00a0Homo sapiens&lt;\/p&gt;\n\" data-image-caption=\"&lt;p&gt;O diprotodonte (g\u00eanero Diprotodon), tamb\u00e9m conhecido como vombate-gigante, foi um marsupial pr\u00e9-hist\u00f3rico australiano parente do vombate, s\u00f3 que muito maior. De fato, ele chegava ao tamanho de um rinoceronte e foi o maior marsupial que j\u00e1 viveu.&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/diprotodonte.jpg?fit=800%2C450&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/diprotodonte.jpg?resize=800%2C450&#038;ssl=1\" alt=\"diprotodonte\" class=\"wp-image-18787\" srcset=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/diprotodonte.jpg?resize=1024%2C576&amp;ssl=1 1024w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/diprotodonte.jpg?resize=300%2C169&amp;ssl=1 300w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/diprotodonte.jpg?resize=768%2C432&amp;ssl=1 768w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/diprotodonte.jpg?resize=150%2C84&amp;ssl=1 150w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/diprotodonte.jpg?w=1200&amp;ssl=1 1200w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><figcaption class=\"wp-element-caption\">O diprotodonte (g\u00eanero <em>Diprotodon<\/em>), tamb\u00e9m conhecido como vombate-gigante, foi um marsupial pr\u00e9-hist\u00f3rico australiano parente do vombate, s\u00f3 que muito maior. Foi o maior marsupial que j\u00e1 viveu.<\/figcaption><\/figure>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-7cfe0f843665d50f5c00b03925caf12a\">N\u00e3o por acaso, muitos especialistas consideram o fim do Pleistoceno como o in\u00edcio do Antropoceno \u2014 uma \u00e9poca geol\u00f3gica marcada pelo dom\u00ednio humano. Ainda que este termo seja debatido, seu simbolismo \u00e9 claro: a humanidade tornou-se uma for\u00e7a geol\u00f3gica. N\u00e3o apenas moldamos paisagens, mas influenciamos a pr\u00f3pria evolu\u00e7\u00e3o de outras esp\u00e9cies.<\/p>\n\n\n\n<figure class=\"wp-block-pullquote has-white-color has-text-color has-link-color has-large-font-size wp-elements-86c31843b77a0fa8db27a21ef0049e03 has-background\" style=\"border-radius:60px;background-image:url(&apos;https:\/\/biologo.com.br\/bio\/wp-content\/uploads\/2025\/07\/megafauna-mamiferos.jpg&apos;);background-size:cover;\"><blockquote><p><strong>\u201cO megat\u00e9rio some no poente \/ como um pressentimento pesado.\u201d<\/strong><\/p><cite>&#8211; Fernando Fernandez (<em>O Poema Imperfeito<\/em>)<\/cite><\/blockquote><\/figure>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-dd6ebc6c69d6ac0f7d3693b67bbf25c9\">Curiosamente, algumas esp\u00e9cies escaparam do destino tr\u00e1gico. Elefantes africanos, bis\u00f5es norte-americanos e cangurus sobreviveram, embora com popula\u00e7\u00f5es reduzidas. Sua persist\u00eancia pode estar ligada a fatores ecol\u00f3gicos, menor densidade humana ou, talvez, pura sorte. Ainda assim, essas exce\u00e7\u00f5es n\u00e3o minimizam a escala do colapso global.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-9d3b806cbeeadfdf104ae164abc4a5f1\">Hoje, os f\u00f3sseis da megafauna s\u00e3o testemunhos silenciosos de um mundo perdido. Museus e s\u00edtios paleontol\u00f3gicos nos lembram que esses gigantes habitaram florestas, estepes e savanas que agora n\u00e3o existem mais. E, acima de tudo, revelam como a presen\u00e7a humana pode acelerar processos naturais at\u00e9 o colapso.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-40cdd82a5818e9df4a8af816614be46f\">Portanto, entender a extin\u00e7\u00e3o da megafauna n\u00e3o \u00e9 apenas um exerc\u00edcio acad\u00eamico. Trata-se de um alerta. Em tempos de aquecimento global, destrui\u00e7\u00e3o de habitats e nova onda de extin\u00e7\u00f5es, o passado ilumina o presente. Afinal, a hist\u00f3ria dos \u00faltimos gigantes \u00e9, em \u00faltima inst\u00e2ncia, a nossa pr\u00f3pria hist\u00f3ria.<\/p>\n\n\n\n<h6 class=\"wp-block-heading has-small-font-size\"><strong>Fontes e refer\u00eancias:<\/strong><\/h6>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color has-small-font-size wp-elements-4861e9443994116942a8845b1a474f5d\">Boivin, N. L., Zeder, M. A., Fuller, D. Q., Crowther, A., Larson, G., Erlandson, J. M., &#8230; &amp; Petraglia, M. D. (2016). <a href=\"https:\/\/www.pnas.org\/doi\/full\/10.1073\/pnas.1525200113\" target=\"_blank\" rel=\"noreferrer noopener\">Ecological consequences of human niche construction: Examining long-term anthropogenic shaping of global species distributions<\/a>. <em>Proceedings of the National Academy of Sciences<\/em>, 113(23), 6388\u20136396. <\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color has-small-font-size wp-elements-a48eff2234a189894337685d49d29b9f\">Dillehay, T. D., Goodbred, S., Pino, M., V\u00e1squez, V., Rosales Tham, T., Conklin, W., &#8230; &amp; Netherly, P. J. (2008). <a href=\"https:\/\/www.science.org\/doi\/10.1126\/science.1156533\" target=\"_blank\" rel=\"noreferrer noopener\">Monte Verde: seaweed, food, medicine, and the peopling of South America<\/a>. <em>Science<\/em>, 320(5877), 784\u2013786. <\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color has-small-font-size wp-elements-78b2aaa74ace4ce23f4d25e00204b4da\">Faith, J. T., &amp; Surovell, T. A. (2009). <a href=\"https:\/\/www.pnas.org\/doi\/10.1073\/pnas.0908153106\" target=\"_blank\" rel=\"noreferrer noopener\">Synchronous extinction of North America\u2019s Pleistocene mammals<\/a>. <em>Proceedings of the National Academy of Sciences<\/em>, 106(49), 20641\u201320645. <\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color has-small-font-size wp-elements-774a980a71b9e6d4a9c6162617c6a24b\">Pitulko, V. V., Nikolsky, P. A., Girya, E. Y., Basilyan, A. E., Tumskoy, V. E., Koulakov, S. A., &#8230; &amp; Pavlova, E. Y. (2004). <a href=\"https:\/\/www.science.org\/doi\/10.1126\/science.1085219\" target=\"_blank\" rel=\"noreferrer noopener\">The Yana RHS site: humans in the Arctic before the last glacial maximum<\/a>. <em>Science<\/em>, 303(5654), 52\u201356. <\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color has-small-font-size wp-elements-6404e8c1d63b167611269ea61494825a\">Wroe, S., Field, J., Fullagar, R., &amp; Jermin, L. S. (2013). <a href=\"https:\/\/www.tandfonline.com\/doi\/abs\/10.1080\/03115510408619286\" target=\"_blank\" rel=\"noreferrer noopener\">Megafaunal extinction in the late Quaternary and the global overkill hypothesis<\/a>. <em>Alcheringa: An Australasian Journal of Palaeontology<\/em>, 32(s1), 15\u201334. <\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter\"><a href=\"https:\/\/biologo.com.br\/bio\/apoie-o-biologo\/\"><img loading=\"lazy\" decoding=\"async\" width=\"174\" height=\"147\" data-attachment-id=\"11979\" data-permalink=\"https:\/\/biologo.com.br\/bio\/caracal-um-mestre-da-sobrevivencia\/apoiepeq\/\" data-orig-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2022\/05\/apoiepeq.jpg?fit=174%2C147&amp;ssl=1\" data-orig-size=\"174,147\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"apoiepeq\" data-image-description=\"&lt;p&gt;Apoie o Bi\u00f3logo&lt;\/p&gt;\n\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2022\/05\/apoiepeq.jpg?fit=174%2C147&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2022\/05\/apoiepeq.jpg?resize=174%2C147&amp;ssl=1\" alt=\"Apoie o Bi\u00f3logo\" class=\"wp-image-11979\" title=\"Apoie o Bi\u00f3logo\"\/><\/a><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"https:\/\/biologo.com.br\/bio\/apoie-o-biologo\/\">Apoie o Bi\u00f3logo<\/a>&nbsp;&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Os \u00daltimos Gigantes: entre 50 mil e 10 mil anos atr\u00e1s, mais de 70% dos grandes mam\u00edferos \u2014 como mamutes,<\/p>\n","protected":false},"author":1,"featured_media":18787,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":false,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[121,25,9,28],"tags":[95,242,61,60,73],"class_list":["post-18802","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-evolucao","category-mamiferos","category-mastozoologia","category-paleontologia","tag-ecologia","tag-evolucao-2","tag-fosseis","tag-paleontologia","tag-zoologia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Os \u00daltimos Gigantes: o colapso da megafauna e a chegada do\u00a0Homo sapiens<\/title>\n<meta name=\"description\" content=\"Entre 50 mil e 10 mil anos atr\u00e1s, mais de 70% dos grandes mam\u00edferos foram extintos. 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