Sooty-fronted Spinetail

The sooty-fronted spinetail is 14 to 16 cm (5.5 to 6.3 in) long and weighs 11 to 17 g (0.39 to 0.60 oz). The sexes have the same plumage. Adults have a thin brownish line through the eye on an otherwise brownish gray face. Their forecrown ("front") is dark gray-brown, their hindcrown and nape dark rufous, and their back, rump and uppertail coverts brown with a rufescent tinge. Their wing coverts are dark rufous and their flight feathers tawny-rufous with dusky tips. Voice: What appears to be the sooty-fronted spinetail's song is variously described as " 'ka-kwee-éék', 'ka-kweek', 'pi-whéé', or 'ja-coo-éé' ", a "very high 2-noted 'du-Twee' ", and "a slow, deliberate teeoopooee". This vocalization is often given for long periods. It also makes a " 'sew-kli' or 'chi-cli', and ated nasal 'hoint'or 'hoít' ".