Darren Naish, a vertebrate paleontologist in Southampton, England, argues that a world inhabited by dinosaurs could still be as diverse as modern birds.|Mammals, however, are a different story. Although they have existed for about 160 million years until the asteroid hit Earth, they are still “small, inferior creatures”, says Brussatte. They are diverse but exceptionally small and live only in distinct environments, he said. “Only when the asteroid knocks off the dinosaurs will the mammals be freed.”|We wouldn’t have to go to a museum to see skeletons or dinosaur models, if the asteroid hadn’t hit Earth 66 million years ago.|IMAGE SOURCE,SPL|Take pictures,|We wouldn’t have to go to a museum to see skeletons or dinosaur models, if the asteroid hadn’t hit Earth 66 million years ago.|Some others don’t think so. They agree that large animals may not have a chance to survive, but bats, rodents, small carnivores and climbing primates, and possums all do. pretty much existed. If marmosets, black-faced langurs and apes can jump branches from tree to tree while dinosaurs are still around, can hominid monkeys still evolve?