Black-capped Chickadee
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{{Taxobox | color = pink | name = Black-capped Chickadee | image = Poecile-atricapilla-001.jpg | image_width = 256px | regnum = Animalia | phylum = Chordata | classis = Aves | ordo = Passeriformes | familia = Paridae | genus = Parus (Poecile) | species = P. atricapillus | binomial = Parus atricapillus | binomial_authority = Linnaeus, 1766 | synonyms = Poecile atricapillus }} The Black-capped Chickadee, Parus atricapillus or Poecile atricapillus, is a small songbird, a passerine bird in the tit family Paridae.
Adults have a black cap and bib with white sides to the face. Their underparts are white with rusty brown on the flanks; their back is grey. They have a short dark bill, short wings and a long tail.
Their breeding habitat is mixed or deciduous woods in Canada, Alaska and the northern United States. They nest in a hole in a tree; the pair excavates the nest, using a natural cavity or sometimes an old woodpecker nest. They may interbreed with Carolina Chickadees or Mountain Chickadees where their ranges overlap.
They are permanent residents, but sometimes move south within their range in winter. On cold winter nights, these birds reduce their body temperature to conserve energy.
Image:Black capped chickadee cp.jpg
These birds hop along tree branches searching for food, sometimes hanging upside down or hovering; they may make short flights to catch insects in the air. Insects form a large part of their diet, especially in summer; seeds and berries become important in winter. They sometimes hammer seeds on a tree or shrub to open them; they also will store seeds for later use.
During the fall migration and winter, chickadees often flock together. Many other species of birds, including titmice, nuthatches, and warblers can often be found foraging in these flocks. Mixed flocks stay together because the chickadees call out whenever they find a good source of food. This calling out forms cohesion for the group, allowing the other birds to find food more efficiently.
The call is the familiar chick-a-dee-dee-dee which gave this bird its name. Recent study of the call shows that the number of dees indicates the level of threat from nearby predators. An analysis of over 5,000 alarm calls from chickadees, it was found that alarm calls triggered small, dangerous raptors had a shorter interval between "chick" and "dee" and tended to have extra "dees", usually averaging four instead of two. In one case, a warning call about a pygmy owl, a prime threat to chickadees, contained 23 dees.Template:Ref
This is the provincial bird of New Brunswick and the state bird of Maine and Massachusetts.
Taxonomic note: Most authorities retain Poecile as a subgenus within a broader view of the genus Parus, but the American Ornithologists' Union treats Poecile as a distinct genus.