There’s an invisible line between two groups of islands in the Indian Ocean with two totally different animal populations. It took three branches of science to figure out why it exists. Hosted by: Olivia Gordon ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters—Alexander Wadsworth, Kevin Bealer, Mark Terrio-Cameron, KatieMarie Magnone, Patrick Merrithew, Charles Southerland, Fatima Iqbal, Sultan Alkhulaifi, Tim Curwick, Scott Satovsky Jr, Philippe von Bergen, Bella Nash, Chris Peters, Patrick D. Ashmore, Piya Shedden, Charles George ---------- Looking for SciShow elsewhere on the internet? Facebook: www.facebook.com/scishow Twitter: www.twitter.com/scishow Tumblr: scishow.tumblr.com Instagram: instagram.com/thescishow ---------- Sources: evolution.berkeley.edu/evolibrary/article/history_16 www.britannica.com/science/biogeography discovermagazine.com/1997/aug/mrwallacesline1198 science.sciencemag.org/content/341/6151/1182.full www.britannica.com/science/biogeographic-region genographic.nationalgeographic.com/migration-to-australia/ -------------- Images: en.wikipedia.org/wiki/File:Alfred_Russel_Wallace_-_Project_Gutenberg_eText_14558.jpg upload.wikimedia.org/wikipedia/commons/0/02/1878_Darwin_photo_by_Leonard_from_Woodall_1884_-_cropped_grayed_partially_cleaned.jpg en.wikipedia.org/wiki/Wallace_Line#/media/File:Wallace-line1.jpg

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