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" ... This specimen also preserves wing membranes as faint impressions in the rock matrix. Also preserved are structural fibers in the portion of the wing that stretches from the hindlimb to the tail called uropatagium, which are rarely found. Rhamphorhynchus, like other pterosaurs, had a membrane of skin and muscle stretching from ankle to elongated fourth finger that formed a wing. Although bats, birds, and pterosaurs all have wings, they are all formed using completely different bone morphologies. Being able to see more about the formation and structure of pterosaur wings allows paleontologists to understand exactly how these enigmatic creatures were able to fly. ... "