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

This small, horned dinosaur is Psittacosaurus, meaning “parrot lizard.” Scientists initially named this relative of Triceratops for its parrotlike beak; later they found evidence that it had feathery fibers along its tail. These simple fibers are an early stage of feather evolution and have been found on many dinosaurs.

©AMNH/C. CHESEK