David Leif Tilden , known as Leif Tilden, is an American actor and director, known for playing Robbie Sinclair in the sitcom Dinosaurs, and gorillas in various films including Born to be Wild, George of the Jungle, Ace Ventura When Nature Calls and Buddy. He is probably most famous for playing Donatello in Teenage Mutant Ninja Turtles and its sequel, being the costume actor for both.
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Source: Wikipedia