Jeff Wendorff's portfolio of woodcreeper images in the family, Furnariidae.

Woodcreeper Wiki
The woodcreepers (Dendrocolaptinae) comprise a subfamily of suboscine passerine birds endemic to the Neotropics. They have traditionally been considered a distinct family Dendrocolaptidae, but most authorities now place them as a subfamily of the ovenbirds (Furnariidae). They superficially resemble the Old World treecreepers, but they are unrelated and the similarities are due to convergent evolution. The subfamily contains around 57 species in 15 to 20 genera.
Woodcreepers range from 14 to 35 cm in length. Generally brownish birds, the true woodcreepers maintain an upright vertical posture, supported by their specialized stiff tails.

Woodcreepers feed mainly on insects taken from tree trunks. However, woodcreepers often form part of the core group at the centre of flocks attending army ant swarms. Woodcreepers are arboreal cavity-nesting birds; two or three white eggs are laid and incubated for about 15 to 21 days.

These birds can be difficult to identify in that they tend to have similar brown upperparts, and the more distinctive underparts are hard to see on a bird pressed against a trunk in deep forest shade. The bill shape, extend/shape of spots/streaks, and call are useful aids to determining species.

My woodcreeper photography portfolio includes:
Cocoa Woodcreeper, Xiphorhynchus susurrans
Spotted Woodcreeper, Xiphorhynchus erythropygius

Collective Noun
I'm not really surprised that I could not find an official collective noun for the woodcreeper. I've thought about this and decided that a hug would be the perfect collective noun for the woodcreeper.

I lead photography workshops and tours on 5 continents and many of them have a bird photography element. Go check out my website Wildlife Workshops and see what I have on tap. Pretty sure that you will be AMAZED!
Cocoa Woodcreeper in PanamaSpotted Woodcreeper in Panama