The Spectacled Tyrant breeds in Argentina, Chile, Uruguay and the extreme south of Brazil and migrates north into Bolivia, Paraguay and south central Brazil during the austral winter. It is invariably found near water usually in marshland or grassland.
It is often seen scurrying along the ground searching for insects.
The male, seen in the first two photos, is usually conspicuous as it sits on a perch or forages on the ground. It has a fleshy, yellow wattle round the eye (which diminishes in size outside the breeding season), a yellow iris, yellow bill and white primaries. Otherwise it is all black.
The female, seen in photos 3, 4 and 5 also has the yellow wattle round the eye though this is less obvious without the black for contrast. It is streaky brown above with two buffy wing-bars and mainly rufous primaries. Below it is pale buff with dark streaking on the chest.
Photo 6 is also of this race and the dark eye suggests that it is an immature.