Pygmy nuthatches nest in cavities in dead stubs of conifers, lining the bottom of the cavity with pine-cone scales, plant down, and other soft plant and animal materials. They may fill cracks or crevices around the entrance with fur; the function of this behavior is unknown. The female lays 4–9 eggs, which are white with fine reddish-brown spotting. She does most of the incubation, which lasts about 16 days. The young leave the nest about 22 days after hatching.
This species is highly gregarious. A nesting pair may have other birds as helpers. Outside the breeding season, this bird wanders in noisy flocks. It also roosts communally; over 100 birds have been seen huddled in a single tree cavity.
At a feeder
All plumages are similar, with a warm gray cap, blue-gray upper-parts, and whitish underparts. The only feature not seen in the photograph is a whitish spot on the nape, particularly in worn plumage (summer). Vocalizations are highly varied chirps, peeps, and chattering.
The pygmy nuthatch features prominently in the climax of the 2000 film Charlie's Angels, in which Cameron Diaz's character, Natalie, discovers the location of the villains' fortress by identifying the call of the pygmy nuthatch, which she says only live in Carmel, California—though the bird shown is not a pygmy nuthatch, which in any case is found in a much wider range. (The Hollywood impostor is a Venezuelan troupial, Icterus icterus.)
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