High Quality Content by WIKIPEDIA articles! The tyrant flycatchers (Tyrannidae) are a family of passerine birds which occur throughout North and South America. They are considered the largest family of birds on Earth, with more than 400 species. They are the most diverse avian family in every country in the Americas, except for the United States and Canada. As could be expected from a family this large, the members vary greatly in shape, patterns, size and colours. Some Tyrant flycatchers superficially resemble the Old World flycatchers. They are members of suborder Tyranni (suboscines) that do not have the sophisticated vocal capabilities of other songbirds.