Sorting organisms into categories seems pretty simple at first, but look a little closer and things get weird. Hosted by: Michael Aranda ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters—we couldn't make SciShow without them! Shout out to Kevin Bealer, Mark Terrio-Cameron, KatieMarie Magnone, Patrick Merrithew, Charles Southerland, Fatima Iqbal, Benny, Kyle Anderson, Tim Curwick, Scott Satovsky Jr, Philippe von Bergen, Bella Nash, Bryce Daifuku, Chris Peters, Patrick D. Ashmore, Charles George, Bader AlGhamdi ---------- 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: www.nature.com/scitable/topicpage/why-should-we-care-about-species-4277923 eol.org/info/468 evolution.berkeley.edu/evolibrary/article/evo_41 science.kennesaw.edu/~rmatson/Biol%203380/3380species.html evolution.berkeley.edu/evolibrary/article/side_0_0/biospecies_01 www.pbs.org/wgbh/evolution/library/05/2/l_052_05.html www.askabiologist.org.uk/from_the_lab/species-concepts science.sciencemag.org/content/354/6314/817 science.sciencemag.org/content/354/6314/818 journals.plos.org/plosone/article?id=10.1371/journal.pone.0068267 Images: commons.wikimedia.org/wiki/File:Ernst_Mayr_PLoS.jpg commons.wikimedia.org/wiki/File:Empidonax_alnorum_CT2.jpg commons.wikimedia.org/wiki/File:Southwestern_Willow_Flycatcher.jpg commons.wikimedia.org/wiki/File:Single-cell-time-lapse-analysis-of-depletion-of-the-universally-conserved-essential-protein-YgjD-1471-2180-11-118-S11.ogv commons.wikimedia.org/wiki/File:Araberganz.jpg commons.wikimedia.org/wiki/File:Donkey_1_arp_750px.jpg commons.wikimedia.org/wiki/File:Juancito.jpg commons.wikimedia.org/wiki/File:Ensatina_eschscholtzii_ring_species.jpg Thumbnail Image: Repeating Patterns of Mimicry. Meyer A, PLoS Biology, Vol. 4/10/2006, e341 journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.0040341