The Woolly Mammoth is an exhibit at the Museum of Natural History.
The Woolly Mammoth is an ancestor to the elephant that was around during the Ice Age. It was hunted by saber-toothed cats and Neanderthals (who hunted it to extinction).
Night at the Museum
In the film, the Woolly Mammoth is seen walking on the upper levels after Larry Daley thew the bone for Rexy. It was the second exhibit Larry saw come to life after Rexy. When Larry got to the Hall of African Mammals, he backed into the extinct mammal, causing it to shove him in. Before it did anything else, Larry shut the door and locked it, making the mammoth leave after a short while.
After Dexter opens the freight entrance, the Woolly Mammoth exits the museum with the Rhinoceros, a Leopard, an Gemsbok, and an Eskimo on sled. With help from Ahkmenrah, Larry is able to get the Woolly Mammoth and the rest of the exhibits back to the museum before sunrise.
Night at the Museum: Secret of the Tomb
In Night at the Museum: Secret of the Tomb, the Woolly Mammoth was seen wandering the museum.