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This Concept Map, created with IHMC CmapTools, has information related to: Barrington Middle, Birds have Beaks, Rapid Digestive systems provide for Light Body Weight, Rapid Digestive systems if necesary due to High Metabolism, Birds have Rapid Digestive systems, feathers help to Fly, Birds have feathers, High Metabolism provides Energy, Birds have Two Wings, feathers offer Isulation, Birds have Two feet, Hollow Bones provide for Light Body Weight, Birds have Hollow Bones