JOSE ANTONIO PENAS / SCIENCE PHOTO LIBRARY JOSE ANTONIO PENAS / SCIENCE PHOTO LIBRARY
Yanoconodon prehistoric mammal, illustration. This prehistoric mammal (Yanoconodon allini) lived 125 million years ago during the Cretaceous. It was unknown until a fossil was discovered in Hebei Province in China, with the results being published in 2007. The fossil was well-preserved, and the structure of the bones of its middle ear provided important evidence on the early evolution of mammals. This mammal also has lumbar ribs, a rare feature among modern mammals.
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