On I want to recognize the Gibraltar 1 Neandertal skull. This year marks 150 since the publication of The Descent of Man, and this skull was the only skeletal evidence of an extinct human ancestor that Charles Darwin encountered.

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It's which is all the excuse I need to post this of the large aquatic sloth Thalassocnus. Darwin never knew of this species or the awesomeness of aquatic sloths in general, but he recovered many bones of other large and giant extinct sloths in his travels.

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In honor of a new post on the surprising drawings on the "Origin of Species" MS. http://t.co/rINLJvPEEh

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