|Adult male in summer plumage|
|Breeding range Wintering range|
The Chestnut-sided warbler (Setophaga pensylvanica) is a New World warbler. They breed in eastern North America and in southern Canada westwards to the Canadian Prairies. They also breed in the Great Lakes region and in the eastern USA.
These birds are migratory, wintering in Central America south to northern Colombia, with an unconfirmed sighting from as far south as Ecuador; they are also very rare vagrants to western Europe. They arrive in their breeding range in May and depart by mid-September.
This species is a moderately-sized New World warbler. Despite having very different plumage, it is thought to be closely related to the widespread yellow warbler. In total, this species measures from 10 to 14 cm (3.9 to 5.5 in) in length and spans 16 to 21 cm (6.3 to 8.3 in) across the wings. Body weight ranges from 8 to 13.1 g (0.28 to 0.46 oz). Among standard measurements, the wing chord is 5.7 to 6.8 cm (2.2 to 2.7 in), the tail is 4.2 to 5.8 cm (1.7 to 2.3 in), the bill is 0.9 to 1 cm (0.35 to 0.39 in) and the tarsus is 1.7 to 1.9 cm (0.67 to 0.75 in).
In the summer, male chestnut-sided warblers are unmistakable in appearance. They display dark-streaked gray backs, white faces, black eyestripes and greenish crowns. Their underparts are white, with chestnut flanks, and they also have two white wing bars. The adult females resemble washed-out versions of the summer male, and in particular, the females lack the strong head pattern, and also have little to no chestnut coloring on their flanks.
Non-breeding birds of both sexes have greenish heads, and greenish upperparts which are usually unstreaked. They also have unstreaked pale grey breasts. Their wing bars are always present in their plumages. Their lack of streaking and greenish backs helps to distinguish this species from the larger blackpoll warbler in the fall.
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The songs are high whistled lines often described as pleased, pleased, pleased to MEECHA. This accented song is used primarily to attract a female and decrease in frequency once nesting is well under way. Males also sing unaccented songs (without the MEECHA at the end) and these are used mostly in territory defense and aggressive encounters with other males. Some males sing only unaccented songs, and they are less successful at securing mates than males that sing both songs. Their calls are harsh chips.
Breeding and habitat
The chestnut-sided warbler has benefited from the clearing of mature forests. They make use of the abundant second growth habitats. In the tropics where they winter however, the species occurs mostly in mature tropical rainforests. Their cup-shaped nests are placed in a low bush, which is usually located in young deciduous woodland or scrub. These birds lay 3–5 eggs that are creamy white or greenish with brown speckles in color. The nest is a small cup woven of bark strips, weed stems, grasses, and plant down. The nest is usually placed in a small crotch of a shrub or vertical tangle of vines no more than 2 m (6.6 ft) above the ground. This species is frequently parasitized by brown-headed cowbirds.
This bird's numbers have increased as second growth forest became more common in the east in the late 19th century; their numbers have declined slightly since then.
Chestnut-sided warblers are primarily insectivorous. They forage actively in shrubs and small trees, and sometimes will attempt to catch insects in mid-air. Most foraging consists of gleaning insects from foliage. They will include berries in their winter diets, such as those of Cymbopetalum mayanum; such trees can be used to attract wintering birds into gardens and parks.
- BirdLife International (2012). "Dendroica pensylvanica". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- Strewe, Ralf; Navarro, Cristobal (2004). "New and noteworthy records of birds from the Sierra Nevada de Santa Marta region, north-eastern Colombia" (PDF). Bulletin of the British Ornithologists' Club 124 (1): 38–51.
- Sage, Louis Bennett; Bishop (1913). Bulletin No. 20, Connecticut geological and natural history survey: The Birds of Connecticut. Hartford, Connecticut: State Geological and Natural History Survey. p. 156. Retrieved May 22, 2011.
- Curson, Jon; Quinn, David; Beadle, David (1994). New World Warblers. London: Christopher Helm. ISBN 0-7136-3932-6.
- Greenberg, Russell (March 1984). The winter exploitation systems of bay-breasted and chestnut-sided warblers in Panama. Zoology 116. Berkeley, California: University of California Press. p. 6. ISBN 0-520-09670-3.
- Foster, Mercedes S. (2007). "The potential of fruiting trees to enhance converted habitats for migrating birds in southern Mexico" (PDF). Bird Conservation International 17 (1): 45–61. doi:10.1017/S0959270906000554.
- Curson, Jon; Quinn, David & Beadle David (1994): New World Warblers. Christopher Helm, London. ISBN 0-7136-3932-6
|Wikimedia Commons has media related to Chestnut-sided Warbler.|
|Wikispecies has information related to: Dendroica pensylvanica|
- Chestnut-sided Warbler videos, photos, and sounds at the Internet Bird Collection
- Chestnut-sided Warbler - Dendroica Pensylvanica - USGS Patuxent Bird Identification InfoCenter
- Chestnut-sided Warbler Species Account - Cornell Lab of Ornithology
- Chestnut-sided Warbler photo gallery at VIREO (Drexel University)
- Chestnut-sided Warbler at Animal Diversity Web