Paul and Irma Milstein Hall of Advanced Mammals features advanced mammals with such traits as hoofs and eye sockets near the snout, in addition to those traits featured in the Hall of Primitive Mammals. A wide range of animals is represented along these evolutionary branches, including cats, seals, bears, primates, horses, whales, and elephants, along with their extinct relatives. Up until about 10,000 years ago, mammoths, mastodons, saber-toothed cats, camels, and giant ground sloths roamed across North America. Then, an episode of extinction wiped all those animals out. The cause of this wave of extinction is unclear, but possible explanations include dramatic climate changes at the end of the last ice age, hunting by humans, and infectious disease.