skeleton of a manatee, and gasp at the dagger-like teeth and multiple horns of the giant hoofed plant-eater Uintatherium. With more than 5,400 species alive today, mammals are classified into 20 different groups, called orders. Students will learn that most of these species nurse their young with milk, have a warm and stable body temperature, and have a secondary palate that allows simultaneous eating see TEACHING TO THE EXTREME page 142
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