Haramiyid hamadryads

The first complete fossil of a 160 million-year-old chisel-toothed, squirrel-sized tree-dweller known as the haramiyid shows that these were well-adapted animals with grasping hands and feet and prehensile tails. They could walk, swim, dig burrows, and glide from branch to branch. Study co-author Jin Meng, a paleontologist at the American Museum of Natural History, declares, "The picture that Mesozoic mammals were shrew-like insectivores that lived in the shadow of the dinosaurs needs to be repainted."

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