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Purgatorius, a kind of mammal called a plesiadapiform, might’ve been one of your earliest ancestors. But how did we get from a mouse-sized creature that looked more like a squirrel than a monkey -- to you, a member of Homo sapiens?

Thanks to Ceri Thomas for the Purgatorius reconstruction. Check out more of Ceri's paleoart at   / alphynix   and http://nixillustration.com

And thanks as always to Nobumichi Tamura for allowing us to use his wonderful paleoart: http://spinops.blogspot.com/

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