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The Northern Parula Setophaga americana, is a small New World warbler. It breeds in eastern North America from southern Canada to Florida.

This species is migratory, wintering in southern Florida, northern Central America, the West Indies and most of the Lesser Antilles.

While the species is still common as a breeder across most of eastern North America, there are conspicuous gaps in their breeding range that were likely once breeding grounds. They have been extirpated as a breeder from much of the Midwest as well as from many areas in Massachusetts, New Jersey, Connecticut, New York, Rhode Island and Vermont. Explanations for the disappearance may be changes in habitat or increasing air pollution, which limited the growth of epiphytes on trees that the warbler depended on for nesting. A further explanation is the clear-cutting and bog draining that have significantly reduced the amount of suitable habitat in eastern North America.

This species has mainly blue-gray upper parts, with a greenish back patch and two white wing bars. The breast is yellowish shading into the white belly. The summer male has bluish and rufous breast bands and prominent white eye crescents. At the end of the breeding season, individuals molt into a duller version of the breeding plumage. Females are similar-looking but tend to be duller and lack the breast bands. The unique breastband fades in males and may disappear altogether in females.

This is a monogamous species, however, a few cases of polygamy have been reported. Southern populations can start breeding as soon as March but to the north of the range, the species does not nest until May.

The Northern Parula forages mostly or entirely on terrestrial invertebrates. Prey items include spiders, damselflies, locusts, bugs, grasshoppers, aphids, beetles, caterpillars, flies, wasps, bees, and ants. Regardless of season, caterpillars and spiders are consumed most often. During the winter, the Northern Parula consumes more beetles and occasionally forages on berries, seeds, and nectar. This species primarily captures prey from vegetation by a hover-glean method, however this species is versatile in using a variety of foraging methods. It may make short flights from a perch to snatch prey in mid-flight or even hang upside-down to forage. It is most often seen foraging in the mid- to upper canopy levels of vegetation. Though most foraging activity occurs in arboreal vegetation, this species occasionally forages on or around the ground as well. The Northern Parula (Setophaga americana) is a small New World warbler. It breeds in eastern North America from southern Canada to Florida.

The Northern Parula is one of the smaller Northern migratory warblers, often being one of the smallest birds in a mixed feeding flock besides kinglets or gnatcatchers. This species has mainly blue-gray upper parts, with a greenish back patch and two white wing bars. The breast is yellowish shading into the white belly. The summer male has bluish and rufous breast bands and prominent white eye crescents. At the end of the breeding season, individuals molt into a duller version of the breeding plumage. Females are similar-looking but tend to be duller and lack the breast bands. The unique breastband fades in males and may disappear altogether in females.

This is a monogamous species, however, a few cases of polygamy have been reported. Southern populations can start breeding as soon as March but to the north of the range, the species does not nest until May. The breeding habitat is humid woodland with growths of Old Man's Beard lichen or Spanish moss. Northern Parulas nest in trees in clumps of these mosses, laying 3–7 eggs in a scantily lined cup nest. Sites located near water sources are preferred and many nests are found at the end of branches suspended over water. Due to their longer breeding season, southern parulas frequently raise two broods, as opposed to northern ones who raise only one. The female hollows out a clump of vegetation in the moss and proceeds to fill the cavity with vegetation fibers, animal hair, grass, or pine needles.

Wikipedia

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