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This Concept Map, created with IHMC CmapTools, has information related to: Untitled 2, birds have feathers, feathers help to fly, feathers offer insulation, warm blooded animals produce heat, birds have two wings, hollow bones provide for light body wieghts, birds have two feet, birds have rapid digestive systems, birds have breaks, birds lay eggs eggs, birds are endotherms, light body wieghts help to fly, food for energy, warm blooded animals maintain constant body tempeture, energy much is required to fly fly, endotherms means warm blooded animals, rapid digestive systems provide for light body wieghts, birds have hollow bones, birds require food, heat from food