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What Makes a Species a Species?

Sorting organisms into categories seems pretty simple at first, but look a little closer and things get weird.

Hosted by: Michael Aranda
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Sources:
http://www.nature.com/scitable/topicpage/why-should-we-care-about-species-4277923
http://eol.org/info/468
http://evolution.berkeley.edu/evolibrary/article/evo_41
http://science.kennesaw.edu/~rmatson/Biol%203380/3380species.html
http://evolution.berkeley.edu/evolibrary/article/side_0_0/biospecies_01
http://www.pbs.org/wgbh/evolution/library/05/2/l_052_05.html
http://www.askabiologist.org.uk/from_the_lab/species-concepts
http://science.sciencemag.org/content/354/6314/817
http://science.sciencemag.org/content/354/6314/818
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0068267

Images:
https://commons.wikimedia.org/wiki/File:Ernst_Mayr_PLoS.jpg

https://commons.wikimedia.org/wiki/File:Empidonax_alnorum_CT2.jpg
https://commons.wikimedia.org/wiki/File:Southwestern_Willow_Flycatcher.jpg
https://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
https://commons.wikimedia.org/wiki/File:Araberganz.jpg
https://commons.wikimedia.org/wiki/File:Donkey_1_arp_750px.jpg
https://commons.wikimedia.org/wiki/File:Juancito.jpg
https://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
http://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.0040341

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