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This Concept Map, created with IHMC CmapTools, has information related to: 2012-01-26-lukef-7783-6, Rapid Digestive System is necesarry due to High metabolism, Birds have Hollow Bones, Rapid Digestive System provide for Light body weights, Birds have Feathers, Feathers help to Fly, Birds have Beaks, Energy much is required to Fly, High metabolism provides Energy, Heat from Food, Feathers offer Insulation, Birds have Two Wings, Warm-Blooded Animals produce Heat, Birds are Endotherms, Light body weights help to Fly, Hollow Bones provide for Light body weights, Endotherms means Warm-Blooded Animals, Food for Energy, Birds have Two Feet, Birds require Food, Birds have Rapid Digestive System