Lions and tigers and bears, oh my! If we're talking about mammals, we can keep going: bats and whales, and humans, oh my! In this lesson, students learn all about mammals. Mammals are an animal classification that share certain features. They breathe air with their lungs, have a backbone, nurse their young, and grow hair. Some mammals walk on 4 legs and others hang from trees. Hey, that sounds just like my little brother...

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