How the Chalicothere Split In Two

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Two extinct relatives of horses and rhinos are closely related to each other but have strikingly different body plans. How did two of the same kind of animal, living in the same place, end up looking so different?

Thanks to Ceri Thomas for the very cool Anisodon reconstruction. Check out more of Ceri's paleoart at http://alphynix.tumblr.com and http://nixillustration.com
And thanks as always to Nobumichi Tamura for allowing us to use his wonderful paleoart: http://spinops.blogspot.com/
Finally, thanks to Dmitry Bogdanov, Roman Uchytel, Ryan Somma and Julio Lacerda for their excellent images as well.

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