Mourning Warbler
Geothlypis philadelphia
Robust warbler found near the ground in thick vegetation. Yellow below with blue-gray head and olive back. Adult males show black chest patch. Females are paler gray on the head; immatures are more olive-toned with a yellowish throat. Breeds in brushy, weedy clearings within mixed or coniferous forest. Often favors raspberry thickets. Tends to stay hidden in low vegetation, so can be difficult to see. Listen for its rolling song, “churry churry churry chew.” Most similar to MacGillivray’s Warbler, but little range overlap, and Mourning has somewhat shorter tail and lacks bold white eye-arcs. Also frequently confused with Common Yellowthroat, especially in fall, but Mourning is larger, with heftier pinkish bill, and brighter yellow underparts.
分类信息
- 学名
- Geothlypis philadelphia
- 命名信息
- (Wilson, A, 1810)
- 目
- Passeriformes
- 科
- Parulidae
- 属
- Geothlypis
分布与栖息地
Mourning warblers have breeding ground in southern Canada, and are commonly seen during migration in the central and eastern United States, Belieze, Bonaire, Puerto Rico, Guatemala, Panama, and other Central American Islands. These birds migrate to Central America and northern South America. Mourning warblers are low or ground nesters, and prefer disturbed forests with a thick under-story and covered canopy. In the winter they prefer wet lowland habitat with dense vegetation.
- 繁殖区
- NA : c Canada to se Canada and ne USA
- 非繁殖区
- Nicaragua to n SA
- 迁徙
- Complete migrants
行为
Mourning warblers forage low in vegetation, sometimes catching insects in flight. These birds mainly eat insects, also some plant material including fruiting bodies from the Cecropia tree in winter. Their diet is not well documented but also includes insect larvae and spiders that they pick from the branches of shrubs. They are also known to remove the legs and wings of the insects before consuming.<p>Mourning warblers breed in southern Canada. Their breeding habitat is thickets and semi-open areas with dense shrubs across Canada east of the Rockies and the northeastern United States. The nest is an open cup placed on the ground in a well-concealed location under thick shrubs or other vegetation. Their nest is usually made out of grass, leaves and bark and lined with roots or other thin material.<p>Mourning warblers typically lay 2-5 eggs, which are white or speckled brown and black in appearance. Incubation is 12 days long and both adult males and females utilize a distraction technique of pretending to have broken wings to distract predators from their nest. Mourning warblers have young with gray tufts on their head and red mouths. Adult females are also known consume their eggs after their young hatch. The number of days for young to fledge is 7–9.<p>The song of this bird is a bright repetitive warble. The warble consists of rolling phrases that sound that typically lower in volume at the end and can sound like "chirry, chirry, chirry, chorry, chorry." The call is a sharp chip. There are usually two different pitched calls, with one higher than the harsh chip.
保护状况
According to the North American Breeding Bird Survey, Mourning Warbler populations have declined by about 43% in the last 50 years. However, they are still categorized as a species of least concern with 17 million estimated as a global breeding population by Partners in Flight. As they have a preference for disturbed forests, they may be benefitting from human development that may be negatively effecting the habitats of other bird species.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Reddish Egret
Egretta rufescens
An entertaining heron to watch—known for sprinting, jumping, and spinning around in shallow water with its wings held up. Dark morph is more common than white morph. Adults are dark gray with a rusty head and neck. Immatures are paler grayish and rusty overall. In breeding plumage, the pink bill and blue lores can become shockingly bright. White morphs are similar to other egrets, but note behavior, grayish legs, and pink bill base (adults). Found exclusively near the coast, especially on mudflats. Typically uncommon, usually seen singly or in scattered small numbers. Dark morph most easily confused with Little Blue Heron, but Reddish Egret is larger and forages much more actively.
MacGillivray's Warbler
Geothlypis tolmiei
Chunky, skulking warbler that favors dense undergrowth. Yellow below and olive above with blue-gray head and chest. Blacker lores set off distinctive white arcs above and below eye. Adult males show darkest head; females and immatures have paler gray head and whitish throat. Found in thickets, clearcuts, open mixed forests, and riparian zones. Breeds primarily in mountainous regions of western North America; winters from Mexico to Costa Rica. Compare with Mourning Warbler, but little range overlap, and note longer tail and white eye-arcs on MacGillivray’s.
Tree Pipit
Anthus trivialis
Slender and streaked pipit. Feeds on the ground like other pipits, but perches readily in trees or bushes when singing, or alights in tree at end of parachuting song flight. As the name suggests, usually associated with trees (on breeding grounds), but also found in agricultural areas and grassy scrub in winter. All pipits look rather similar and are best identified to species by combination of habitat and voice: Tree Pipit call a high, shrill, buzzy "tzzz"; song more melodic and varied than Meadow Pipit song.
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