Fossils are body parts of animals that lived very long ago. Not many long-ago mammals are preserved as fossils. But some entire mammal fossils have been discovered, such as a 10-foot (3-meter) woolly mammoth preserved in Siberian frozen ground, and an Ice Age woolly rhinoceros discovered inPoland, preserved in asphalt. Many long-ago mammals lived in a warm, wet world. They ate soft, leafy plants. The earliest known mammals were possibly shrew-like creatures living about 190 million years ago. Later larger mammals occurred, then disappeared, or became extinct. These include the mesohippus, a three-toed horse only 24 inches (60 centimeters) high; a giant pig with a head that was 4 feet (1.22 meters) in length; and the smilodon, a huge saber-toothed cat with canine teeth that were 8 inches (20.3.centimeters) in length. By about 15,000 years ago, long-ago people were hunting mammals with stone-pointed spears. [download]
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