Mammals appeared about 190
million years ago, and became dominant after extinction of dinosaurs
some 65 million years ago. Mammals are warm-blooded, hairy animals
with backbones, possessing four-chambered hearts and diaphragms to
help breathing. Most give birth rather than laying eggs, and all
feed their young from milk-producing mammary glands unique to
the class Mammalia.
Coryphodon - Eocene Epoch
Megacerops - Oligocene Epoch
Short-faced Bear - Pleistocene Epoch
Woolly Mammoth - Pleistocene Epoch
University of California
University of California, Museum of Paleantology
National Park Service, Geologic Resources Division
Paleocene mammals of the world
Paleo Mammal Site
Evolution of Mammals
Livre d'Urantia
