Guianan Woodcreeper

The Guianan woodcreeper is 17 to 19 cm (6.7 to 7.5 in) long; males weigh 19 to 24 g (0.67 to 0.85 oz) and females 18 to 20.5 g (0.63 to 0.72 oz). It is a smallish woodcreeper with a slim decurved bill. The sexes have the same plumage. Adults' face, crown, and nape are dusky brown with fine buff spots on the crown that are sparser on the nape and absent from the back. Their back and wing coverts are dark russet-brown, and their rump, wings, and tail rufous-chestnut with blackish brown tips on the primaries. Their throat is plain buffy. Their breast and belly are grayish brown to olive-brown with bold, blackish-edged, pale buff to creamy white streaks. Their undertail coverts are cinnamon-brown and their underwing coverts are cinnamon to ochraceous. Their iris is dark brown to chestnut and their legs and feet brown or gray to pea-green. Their bill's maxilla has a blackish or brown to dark horn-gray base and a pale horn to yellowish end, and their mandible is whitish or pale gray to pinkish. Juveniles have darker upperparts than adults, a grayer crown with more obvious spots, and whiter, somewhat reduced, streaks on the underparts.

The Guianan woodcreeper is found in northern Amazonia in the eastern Venezuelan states of Delta Amacuro and Bolívar, the Guianas, and northern Brazil north of the Amazon River from the Rio Negro east to the Atlantic ocean. It mostly inhabits terra firme and floodplain forest. It occurs less often in swamp forest, flooded várzea forest, and savanna, and in a few places semi-deciduous and gallery forest. It favors the interior and edges of tall primary forest and mature secondary forest and is found only rarely in younger secondary forest. In elevation it mostly ranges below 1,000 m (3,300 ft) but is occasionally found as high as 1,800 m (5,900 ft) in Venezuela.

The Guianan woodcreeper's diet is primarily arthropods. It usually forages singly or in pairs, and often joins mixed-species feeding flocks. It hitches along branches, often on their underside, mostly in the forest's sub-canopy and canopy, occasionally in the middle levels, and rarely if ever in the understory. It takes most of its prey from bark, by picking, probing, and prying off flakes. It also sometimes probes vegetation like epiphytes but only infrequently sallies after airborne prey.