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This Concept Map, created with IHMC CmapTools, has information related to: birds2, Rapid Digestive Systems High Metabolism, Birds ???? require, Birds have Hollow Bones, Birds have Beaks, Birds have ????, Birds ???? ????, require ???? Food, Warm-Blooded Animals contain Constant Body Temperature, Birds have Feathers, Birds are Warm-Blooded Animals, Birds have Two Wings, Birds have Rapid Digestive Systems