Northern long-tailed woodcreeper

The northern long-tailed woodcreeper was formerly considered to be part of the former long-tailed woodcreeper (the original Deconychura longicauda) with what are now the little long-tailed woodcreeper (D. typica) and the southern long-tailed woodcreeper (D. pallida). BirdLife International's Handbook of the Birds of the World (HBW) has treated them separately since the 2010s, and the International Ornithological Committee (IOC) followed suit in July 2023.[2][3] However, the North American and South American Classification Committees of the American Ornithological Society and the Clements taxonomy treat the long-tailed woodcreeper as one species. The AOS notes that it probably consists of at least two and possibly three species.[4][5][6]

The northern long-tailed woodcreeper is monotypic.[2]

The northern long-tailed woodcreeper is a medium-sized member of its subfamily, with a slim body, long wings and tail, and a slim medium-length straight bill. It is 16 to 21 cm (6.3 to 8.3 in) long and weighs about 22 to 36 g (0.78 to 1.3 oz). Males are longer and heavier than females, and both length and weight vary among the subspecies. The plumages of males and females are alike. Adults are mostly olive-brown with a darker crown and nape that have fine buff streaks. Their lores and supercilium are whitish to rich buffy. Their wings, uppertail coverts, and tail are rufous-chestnut; their primaries have dusky tips. Their throat varies from whitish buff to ochraceous, their breast is olive-brown with buff streaks, their belly and flanks are plain olive-brown, and their undertail coverts are rufous. Their underwing coverts and the underside of the flight feathers are cinnamon rufous. Their iris is brown, their bill has a brownish maxilla and bluish mandible, and their legs and feet are brown. Juveniles are very similar to adults, with a slightly darker head and fewer pale streaks on the breast.[7]

The northern long-tailed woodcreeper is found in the Guianas and in northern Brazil north of the Amazon River and east of the Rio Negro. It inhabits a variety of forested landscapes where it favors the interior of humid primary forest. It does occur at the forest edges and in mature secondary forest. It is mostly found in terra firme and várzea forest up to about 500 m (1,600 ft).[7][8]

The IUCN has assessed the northern long-tailed woodcreeper as being of Least Concern. It has a fairly large range but its population size is not known and is believed to be decreasing. Habitat modification and fragmentation for agriculture and ranching is cited as a threat.[1] It is considered fairly common to common in much of its range but rare in Suriname. It occurs in several protected areas. "It appears to be highly sensitive to habitat modification and requires nearly continuous forest to persist."[7]