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This Concept Map, created with IHMC CmapTools, has information related to: 2012-01-26-elesaaaaaaa-t-heyyyyyy-7773-25, birds some do fly, energy much is required to fly, food for energy, warm blooded animals maintain constant body temperature, birds have rapid digestive systems, feathers help to fly, birds have 2wings, birds require food, birds have beaks, heat from food, feathers offer insulation, rapid digestive systems is necesarry due to high metabolism, birds are endotherms, high metabolism provides energy, endotherms means warm blooded animals, birds have hollow bones, light body weights help to fly, birds have 2feet, hollow bones provide for light body weights, birds have feathers