Prehistoric Mammals Author:Jerry Tiritilli, Q. L. Pearce PREHISTORIC MAMMALS will take you back in time to the days when animals the size of buildings roamed the earth. Find out why some animals are still around today and others are not. You'll get to see what the earth looked like before there were people living on it. — Learn about flying bats, ancient elephants and horses, and the largest land m... more »ammal ever to walk the earth - the paraceratherium ... Read all the fun and exciting facts about what the earth was like hundred of thousands of years ago and try the gun experiments and activities you can do right at home.