Full Name
Known for
Cheeky, helpful and friendly monkey.
Museum of Natural History, New York
Portrayed by

Dexter is a small Capuchin Monkey who lives in the Hall of African Mammals at the Museum of Natural History. He is portrayed by monkey actor Crystal the Monkey who also portrays Able in the second film. He is a supporting character in Night at the Museum, a minor character in Night at the Museum: Battle of the Smithsonian and a major character in Night at the Museum: Secret of the Tomb.


Night at the Museum

Dexter first appears in the film Night at the Museum. A Capuchin Monkey on display in the Hall of African Mammals who at first seems cute and cuddly but is actually quite cheeky. When Larry Daley has his first Night Guard shift, Dexter causes a lot of trouble for him. Dexter tears up the list which Larry was using to help him, bites his nose, urinates on Larry, and even steals his keys to unlock the storage gate releasing the exhibits into Central Park.

Night at the Museum: Battle of the Smithsonian

Dexter also appears in Night at the Museum: Battle of the Smithsonian. In the film, he plays a much smaller role. In the beginning, Larry finds out the tablet was actually stolen by Dexter and now Akhmenrah's evil brother Kahmunrah came to life and imprisoned the New York exhibits in the storage bin. The movie also has a funny gag when the monkey jams the crate lid on Larry's fingers. But Able the Space Monkey has a larger role in the film. Able teams up with Dexter and in one scene they both slap Larry back and forth, until he hits them back. Unlike the mischievous Dexter, Able is a respectful monkey who helps Larry defeat Kahmunrah.

Night at the Museum: Secret of the Tomb

Dexter appears in Night at the Museum: Secret of the Tomb. He goes with the others to the British Museum. He saves Jedidiah and Octavious by urinating on them to stop a lava flow after the Pompeii model volcano erupted. Information Needed.


  • Trainers spent several weeks training Crystal the Monkey to slap and bite Ben Stiller in the film.
  • Shawn Levy did not like the wax figure the producers made to look like the monkey because it looked really ugly and looked nothing like the real Crystal.
  • Since Animals have the same labor laws as children, Crystal the Monkey was only able to work so many hours of the day. This meant when she was released from the set everyday during filming, Ben had work with a stuffed monkey that Levy used off camera.
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