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This Concept Map, created with IHMC CmapTools, has information related to: 2012-01-26-ian-c-7773-25, Endotherms means Warm-Blooded Animals, energy much is required to fly fly, Hollow Bones Provide for Light body weights, Birds have Hollow Bones, Birds require food, Heat from food, Feathers offer Insulation, Birds have Two Wings, Birds are Endotherms, Warm-Blooded Animals maintain Constant Body Temperature, food for energy, Rapid Digestive System Provide for Light body weights, Rapid Digestive System is necesarry due to High metabolism, High metabolism provides energy, Birds have Feathers, Warm-Blooded Animals produce Heat, Birds have Rapid Digestive System, Birds have Beaks, Birds some do fly, Light body weights help to fly