"Over the course of Cenozoic diversification,
other birds did assume modes of life similar to those
vacated by pterosaurs: skimmers may roughly correspond to
Tropeognathus with its keeled jaws, swallows and swifts to
Pterodactylus with its similar size and wing proportions, flamingos
to Pterodaustro with its bristling array of fringe-like teeth, and
perhaps even condors to the enormous Quetzlcoatlus".