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Mammals are identified by a combination of warm blood, body fur or hair, and glands that produce milk to feed their young; beyond these few common traits, however, mammals are wildly diverse in shape, size, habitat and behavior. From our common domestic animals (dogs, cats, horses and goats) to their wild cousins (wolves, lions and gorillas) and including human beings, mammals make up a classification of animal as varied as people in the world.


Although sometimes grouped in with "wild dogs," hyenas aren't even related to canines. Although they bark, yelp, and are social just like wild dogs, they're actually more closely related to the mongoose.
 

 

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Click on the individual animals on the left column to get more cool facts.