Some reptiles, birds, and sharks have full nictitating membranes; in many mammals, a small, vestigial portion of the membrane remains in the corner of the eye.
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The posterior median eyes (PME) are vestigial in many species, but in some primitive sub-families they are comparable in size with the other secondary eyes and help to detect motion.
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Its sternal keel was reduced, but not enough to prevent flight, as the adept flying Cyanoramphus parrots also have reduced keels, and even the flightless kakapo, with its vestigial keel, is capable of gliding.