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