Kalinowski's Chat-Tyrant

Kalinowski's chat-tyrant is 12.5 to 13 cm (4.9 to 5.1 in) long. The two subspecies are almost alike. Adult males of the nominate subspecies have a dark gray-brown crown and a yellow forecrown that continues and becomes white as a supercilium that extends somewhat past the eye on an otherwise dark brown face. Subspecies S. s. boliviana has a longer supercilium that extends almost to the nape but otherwise has the same plumage as the nominate. The subspecies' upperparts are dark gray-brown. Voice: The dawn song of Kalinowski's chat-tyrant is "a high, descending whistle followed by a lower rising note: tseeeut...ree? sometimes interspersed with a squeaky chatter". Its call is "a long, abruptly rising, then slowly falling, thin, high, trill: WREEzzeeeeerrrrr".