Reptiles Amphibians Birth Growth Author:Andres Llamas Ruiz From alligators to salamanders and everything in between, the world of reptailes is unique--and very different from our own. There are 6,770 kinds of reptiles and more than 4,000 types of amphibians on the earth today. Readers learn what it's like to be a reptile or amphibian--from birth to reproduction to old age. Full color.