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This Concept Map, created with IHMC CmapTools, has information related to: Birds Leg TWO, WARM-BLOODED ANIMALS MAINTAIN CONSTANT BODY TEMPERATURE, ENDOTHERMS MEANS WARM-BLOODED ANIMALS, FOOD FOR ENERGY, have ???? BEAKS, WARM-BLOODED ANIMALS PRODUCE HEAT, for ???? ENERGY, FOOD ???? for, require ???? FOOD, BIRDS ARE ENDOTHERMS, have ???? FEATHERS, ENERGY ???? much is required to, much is required to ???? FLY, have ???? TWO FEET, have ???? HOLLOW BONES, HEAT ???? FOOD, ENERGY MUCH IS REQUIRED TO FLY, HEAT FROM FOOD, BIRDS ???? require, BIRDS ???? have, have ???? RAPID DIGESTIVE SYSTEM