The Fork-tailed Flycatcher (Tyrannus savana) breeds in Middle and South America and occurs in North America as a vagrant. Monroe and Barron (1980) summarized 40 reports of Fork-tailed Flycatchers in the United States and Canada and concluded that "North American vagrants... have been presumed to be vagrants that 'overshot' their normal 'wintering' grounds in northern South America." While they noted some movements that did not fit this pattern, they offered no hypothesis to explain them.