ALT Megacerops, a hulking “thunder beast” that once roamed present-day South Dakota, one of many refurbished fossil mounts on view at the renewed Peabody Museum.

ALT A model of a male Pteranodon perches atop the welcome desk at the Peabody’s main entrance. A female and two babies nest on the window ledge at the right.

ALT Brontosaurus takes center stage in the Burke Hall of Dinosaurs.

ALT The American mastodon, previously displayed in profile behind glass, wields its mighty tusks in the open, seemingly ready to stride from its platform.