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This Concept Map, created with IHMC CmapTools, has information related to: birds two, Birds have Beaks, Birds have Feathers, Birds ???? Warm-Blooded Animals, Rapid Digestive Systems is necessary due to High Metabolism, Birds have ????, Birds have Two Wings, Birds have Two Feet, Birds have Rapid Digestive Systems, Warm-Blooded Animals ???? ????, Birds have Hollow Bones