‘Dinosaurs Among Us’ at American Museum of Natural History, Selected by Mark Dion

This giant, flightless bird—Gastornis gigantea—would have been an intimidating opponent. It’s even bigger than a Velociraptor, its not-so-distant relative. But while it might have looked frightening, scientists now think this extinct bird was actually a vegetarian related to ducks and geese.

ZHAO CHUANG/COURTESY PEKING NATURAL SCIENCE ORGANIZATION