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This Concept Map, created with IHMC CmapTools, has information related to: 2012-01-26-zachary.t, food for enrgy, endotherms means warm boolded animals, birds have feathers, birds have rapid digestive systems, birds have beaks, enrgy much is required to fly, birds lay eggs, feathers help to light body weights, rapid digestive systems provide for light body weights, birds require food, birds have hollow bones, feathers help to fly, birds are endotherms, feathers offer insulation, hollow bones provide for light body weights, heat from food, warm boolded animals produce heat, birds have two feet, birds have two wings