The head was small and light with large eyes that faced to the sides. The forelimbs were weak while the hindlimbs were proportionally long. The hands were proportionally the shortest of any ornithomimosaur and each had three digits with curved claws. The neck was proportionally long in relation to the trunk. Many of the vertebrae had openings that indicate they were pneumatic (air-filled). As evidenced by its relative Ornithomimus, it would have had feathers. Gallimimus is the largest known ornithomimid adults were about 6 metres long, 1.9 metres tall at the hip and weighed about 440 kilograms.
More fossil specimens of Pteranodon have been found than any other pterosaur, with about 1,200 specimens known to science, many of them well preserved with nearly complete skulls and articulated skeletons. They lived during the late Cretaceous geological period.
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