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Dinosaur Extinction and the Rise of Mammals

The dinosaurs' demise has been linked to the rise of mammals, but a new study says the connection isn't so direct. Scientists have assembled a complete family tree for all existing mammals, and this "supertree" tells them how different groups were created and when they diverged.

Guest:

Ross MacPhee, curator, Division of Vertebrate Zoology, American Museum of Natural History.

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