Hu Yaouming, unseen, a graduate student who studies at the American Museum of Natural History points to the the fossil of a 130 million year-old mammal called Repenomamus robustus with the remains of a very young Psittacosaurus in its stomach Wednesday, Jan. 12, 2005 at the American Museum of Natural History in New York. Scientists say the animal's last meal probably is the first proof that mammals hunted small dinosaurs some 130 million years ago. It contradicts conventional evolutionary theory that early mammals were timid, chipmunk-sized creatures that scurried in the looming shadow of the giant reptiles. (AP Photo/Frank Franklin II)