White-browed Chat-Tyrant

The white-browed chat-tyrant (Ochthoeca leucophrys) is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is found in Argentina, Bolivia, Chile, Ecuador, and Peru. == Taxonomy and systematics == The white-browed chat-tyrant was originally described as "F[luvicola] leucophrys". The white-browed chat-tyrant has these six subspecies: O. l. dissors Zimmer, JT, 1940 O. l. interior Zimmer, JT, 1930 O. l. urubambae Zimmer, JT, 1937 O. l. leucometopa Sclater, PL & Salvin, 1877 O. l. leucophrys (d'Orbigny & Lafresnaye, 1837) O. l. tucumana Berlepsch, 1906 During much of the first half of the twentieth century, what is now the Piura chat-tyrant (O. piurae) was considered an additional subspecies, and at least one publication suggests that it should return to that status. The white-browed and Piura chat-tyrants form a superspecies. In addition, it has been suggested that urubambae be merged into interior. == Description == The white-browed chat-tyrant is 14.5 to 15.5 cm (5.7 to 6.1 in) long. The sexes have the same plumage. Adults of the nominate subspecies O. l. leucophrys have a dark gray to grayish brown crown, a wide white supercilium that begins at the lores and extends well past the eye, and a blackish "mask". Their…