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 known, 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. The members vary greatly in shape, patterns, size and colors.
The unrelated, except by name, silky-flycatchers are a small family, Ptiliogonatidae, of passerine birds. The family contains only four species in three genera. They occur mainly in Central America from Panama to Mexico, with one species, the phainopepla, extending northwards into the southwestern US.