Giants from the Past [antikvár]

Visitors to museums in many cities walk through exhibits that recall life on earth long ago. Many people pause at displays that show huge animals. Some of these animals look like animals of today, but they are much larger. These giants lived during a period of time called the Age of Mammals. This age followed a period called the Age of Reptiles, and it started long before the beginning of human histoiy. It included the Ice Age^^ when great ice sheets covered many parts of the world. The earth's past peers down from monster mammal skeletons. A mastodon (left) displays huge, curving tusks in the Field Museum of Natural History, in Chicago, Illinois. A giant ground sloth (right), at the National Museum of Natural History, towers over Tony Munroe, 12, of Washington, D. C.