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This Concept Map, created with IHMC CmapTools, has information related to: Birds4, Birds are Endotherms, Birds require Food, Birds have Beaks, Birds reproduce Sexually, Warm-Blooded Animals maintain Constant Body Temperature, Birds have Two Wings, Rapid Digestive Systems is necesarry due to High metabolism, Birds have Feathers, Endotherms means Warm-Blooded Animals, Food for Energy, Hollow Bones provide for Light body weights, Light body weights help to Fly, Birds lay Eggs, Rapid Digestive Systems provide for Light body weights, Feathers offer Insulation, Feathers help to Fly, Birds some do Fly, Birds have Two Feet, Energy much is required to Fly, Heat from Food