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This Concept Map, created with IHMC CmapTools, has information related to: 2012-1-25-morgan-b-7783-6, birds have two feet, birds lay eggs, birds require food, rapid digestive systems is necesarry due to High metabolism, feathers help to fly, hollow bones provide for light weight bodies, birds have feathers, energy much is required to fly, warm blooded animals produce heat, birds some do fly, food from heat, birds have rapid digestive systems, rapid digestive systems provide for light weight bodies, birds have hollow bones, feathers offer insulation, birds have beaks, birds are endotherms, light weight bodies help to fly, warm blooded animals maintain constant body temperature, food for energy