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Breeds in northern boreal areas from Alaska south to central Canada (absent only from southern Canada and extreme arctic Canada. In the United States found in northern Maine, New Hampshire, Vermont and in the Adirondacks and Catskills in New York.
Blackpolls are notable for their fall migration route, when they take off from south-eastern Canada and north-eastern US and fly non-stop over the Atlantic to northern South America. They average 11 grams when they depart and 7 when they arrive.
Mature deciduous trees, coniferous forest, particularly spruce, cypress trees in coastal scrub. Swampy woodland. Also urban parks on migration.
The diet includes insects, but berries are taken in the winter.
The 4-9 eggs are laid in a cup-shaped nest which is placed in a conifer.
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