| | Large Herbivores Increase Forest Diversity Rhinoceroses and elephants play a critical role in keeping the tropical forests of Southeast Asia healthy. These large herbivores help to disperse seeds and in doing so bolster forest regeneration... Read more | Facts About Mammals Did you know there are 21 groups of mammals? Or that there are nearly 5,000 species of mammals? Find out these facts and more in this article about mammals.... Read more | All About Amphibians Amphibians are a group of animals that includes newts, salamanders, caecilians, frogs and toads. There are between 5,000 and 6,000 species of amphibians alive today. The following articles will introduce... Read more | Amphibians Amphibians are a group of backboned animals that includes salamanders, newts, caecilians, frogs and toads. There are between 5,000 and 6,000 species of amphibians alive today. The first amphibians arose about 370 million years ago during the Devonian Period. The articles listed below provide information about the characteristics, classification and evolution of amphibians. | | | | Animals / Wildlife Ads | | | | Featured Articles | | | | More from About.com | | | | | | Bake Sale Bestsellers Make your next bake sale a profitable one with these irresistible recipes. More>
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