Collection introduction: The fossils in the collection belong to 110 genera and species in 7 orders and 2 classes, representing 4 different mammal groups in the late Cenozoic Era, including the giant rhinoceros fauna 30 million years ago and the giant rhino group 1,300 years ago. There are more than 30,000 items in total including the spade-toothed elephant fauna from 10,000 years ago, the three-toed horse fauna from about 10 million years ago, and the true horse fauna from 2 million years ago.