Well, perhaps "creeper" would be a more accurate title than "creepers" since Montana hosts a single species within this family, the brown creeper (Certhia americana). Anyone who has seen this bird would have no question where it got its name. I have many pictures of this species but every picture is the same as the one below--the only difference is a bit of snow on the tree, a different background color, etc. When you catch the attention of a brown creeper slowing climbing its way up a tree trunk, it first tries to stare you down with an intimidating gaze (see below, if you dare). Then, having identified you as nonthreatening, goes on about its business of locating and eating small insects. We often see brown creepers in cross-species flocks which include hairy and downy woodpeckers, nuthatches, and chickadees. It is quite amusing to watch a white-breasted nuthatch moving headfirst down the trunk of a large pine tree meet a brown creeper moving headfirst up it. Different strokes for different folks.