Dusky leaftosser

The dusky leaftosser or South American leaftosser (Sclerurus obscurior) is a bird in subfamily Sclerurinae, the leaftossers and miners, of the ovenbird family Furnariidae. It is found in Bolivia, Brazil, Colombia, Ecuador, French Giana, Guyana, Panama, Peru, Suriname, and Venezuela.

The dusky leaftosser is 15 to 17 cm (5.9 to 6.7 in) long and weighs 20 to 30 g (0.71 to 1.1 oz). The sexes are alike. Adults of the nominate subspecies S. o. obscurior have dark reddish to chestnut brown upperparts, with their rump and uppertail coverts being more chestnut than the reddish back. Their wings are darker brown than their back and their tail is dark brown to black brown. Their face is brownish, their throat is tawny chestnut, and their chest and breast are a darker chestnut. Their bill is fairly long and straight with a dark maxilla and a bicolored mandible. Their iris is brown and their legs and feet are dusky to black. Juveniles are similar to adults but are overall duller and have light streaks on their breast and a light scaly appearance on their throat and chest.

Subspecies S. o. andinus is generally paler than the nominate but has a brighter rufous cast to its rump. S. o. peruvianus has entirely dark reddish brown upperparts without the chestnut rump of the nominate and andinus. S. o. macconnelli is similar to peruvianus but is somewhat olivaceous overall with a more tawny throat. S. o. bahiae has a browner back, a much brighter chestnut rump, and a darker throat than the other subspecies.