Description wikipedia

The rufous-naped ground tyrant (Muscisaxicola rufivertex) is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is found in Argentina, Bolivia, Chile, and Peru. The rufous-naped ground tyrant is 15.5 to 18 cm (6.1 to 7.1 in) long and weighs about 19 to 22 g (0.67 to 0.78 oz). The sexes have the same plumage. Adults of the nominate subspecies M. r. rufivertex have a bright cinnamon or orange-rufous patch on the crown and a faint white supercilium and broken eye-ring on an otherwise pale gray head. Their upperparts are also mostly pale gray, with a black lower rump. Their wings are a dusky gray. Their tail is dusky with thin white edges on the outer webs of the outermost feathers. Their throat and belly are whitish and their breast pale gray. Subspecies M. r. pallidiceps is smaller than the nominate and has a paler crown patch, a thinner supercilium, paler ashy gray upperparts, and a blacker tail. M. r. occipitalis is larger than the nominate, with a rufous crown, slightly darker wings, and a noticeably darker tail. Subspecies M. r. achalensis has a reddish-cinnamon crown, a white supercilium, brown wing coverts, blackish brown primaries and secondaries, and white underparts. All subspecies have a dark brown iris, a long thin black bill, and black legs and feet.