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