Description wikipedia

The sulphur-bearded reedhaunter or sulphur-throated spinetail (Limnoctites sulphuriferus) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Argentina, Brazil, and Uruguay. The sulphur-bearded reedhaunter is 15 to 16 cm (5.9 to 6.3 in) long and weighs 12 to 14 g (0.42 to 0.49 oz). The sexes have the same plumage. Adults have a buffish white supercilium on an otherwise grayish-streaked whitish face. Their crown, back, rump, and uppertail coverts are olive-brown. Their tail feathers are sharply pointed; the central pair are brownish and longer than the others, which are more rufous. Their greater and median wing coverts are rufous, the primary coverts and secondaries dark fuscous, and the primaries rufous with rich tawny bases. Their chin and center of their throat are yellow, their breast whitish with thin grayish streaks, their belly whitish, and their flanks and undertail coverts tawny-buff. Their iris is whitish red to orange-pink, their maxilla blackish brown to black, their mandible pinkish white to whitish, and their legs and feet greenish gray to pale olive-green. Juveniles have darker upperparts and more ochraceous underparts than adults, with no yellow on the chin and no streaks on the breast.