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

This bizarre, birdlike dinosaur, called Microraptor gui, has feathers on both its front and back limbs. And those rear leg feathers weren’t just decorative; they show adaptations for flight. But could this creature really fly? Probably not far under its own power. But it might have glided down from trees, perhaps even flapping its front limbs.

ZHAO CHUANG/COURTESY PEKING NATURAL SCIENCE ORGANIZATION