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This Concept Map, created with IHMC CmapTools, has information related to: Birds Leg TWO2, ENDOTHERMS MEANS WARM-BLOODED ANIMALS, FOOD FOR ENERGY, WARM-BLOODED ANIMALS PRODUCE HEAT, BIRDS ARE ENDOTHERMS, BIRDS Have Feathers, BIRDS Have Hollow Bones, BIRDS Have Beaks, BIRDS Have Wings, ENERGY MUCH IS REQUIRED TO FLY, Hollow Bones Provide light body weight, Feathers Offer Insulation, WARM-BLOODED ANIMALS Maintain Constant Body Temperature, FOOD require BIRDS, BIRDS Lay Eggs