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This Concept Map, created with IHMC CmapTools, has information related to: Paul MacDonald 7783-5 Bird Eval, Birds have feathers, Birds have hollow bones, Birds lay eggs, Birds some do fly, rapid digestive systems profide for light body weights, Birds have rapid digestive systems, Birds have two feet, endotherms means warm-blooded animals, energy much is required to fly, feathers help to light body weights, rapid digestive systems is neccessary due to high metabolism, feathers help to fly, food from heat, Birds have beaks, food for energy, Birds are endotherms, warm-blooded animals maintain constant body temperature, Birds require food, Birds have two wings, warm-blooded animals produce heat