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This Concept Map, created with IHMC CmapTools, has information related to: 2012-01-26 isabelbd 7783-6, Birds have Two Wings, Birds are Endotherms, Birds have Rapid Digestive Systems, Birds lay Eggs, Birds have Feathers, Birds have Beaks, Heat From Food, Endotherms means Warm- Blooded Animals, Warm- Blooded Animals produce Heat, Birds have Two Feet, ???? some do Fly, Energy much is required to Fly, Hollow Bones provide for Light Body Weights, Birds require Food, Birds have Hollow Bones, Feathers help to Fly, Food for Energy, Rapid Digestive Systems is necesarry due to High metabolism, Warm- Blooded Animals maintain Constant Body Temperature, Rapid Digestive Systems provide for Light Body Weights