Olivier is a minor bird character in the Peanuts comic strip by Charles M. Schulz. He is one of Woodstock's bird friends and one of Snoopy's Beagle Scouts. The character is first named in the strip from March 27, 1978. Oliver is often depicted as the most clueless of the Beagle Scouts, often bringing odd items on their campouts or responding improperly to the roll call.
Although he is not identified in The Peanuts Movie, the bird that appears to constantly mess up in the film is likely intended to be Olivier.