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This Concept Map, created with IHMC CmapTools, has information related to: Copy (3) of Copy of Untitled 2, Birds lay Eggs, Birds have hollow bones, light body weights help to Fly, heat from food, food for energy, feathers offer insulation, warm-blooded animals produce heat, Birds SOME DO Fly, Birds have feathers, rapid digestive systems provide for light body weights, energy much is required to fly Fly, Birds have beaks, hollow bones provide for light body weights, Birds have two feet, warm-blooded animals maintain constant body temperature, Birds have two wings, Birds have rapid digestive systems, feathers help to Fly, Birds require food, Birds are endotherms