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A photo of a Pacific Wren (Troglodytes pacificus)
Pacific Wren

Pacific Wren

Troglodytes pacificus

The Pacific wren, Troglodytes pacificus, is a diminutive bird, a denizen of North America and a constituent of the predominantly New World wren family, Troglodytidae. Its plumage is rufous brown atop, with a richer hue below, and it is barred with darker brown and dusky shades, extending even to the wings and tail. The bill presents as dark brown, while the legs are of a paler brown. Juveniles exhibit less pronounced barring.

Identification Tips

When endeavoring to identify the Pacific wren, look for its small stature and the distinctive barring across its underparts and upperparts. Its tail is typically held upright, and its overall coloration is a rich, rufous brown, which can be a key distinguishing feature.

Habitat

The preferred habitat of the Pacific wren is the coniferous forests, particularly those dominated by spruce and fir trees. Here, it thrives and is often detected by its melodious and elaborate song.

Distribution

This species breeds along the Pacific coast, from Alaska down to California, and extends inland as far as Wyoming and the Black Hills of South Dakota. During migration and winter months, it can be found across the western half of the United States and Canada.

Behaviour

The Pacific wren is known for its incessant movements as it creeps or climbs in search of arthropods, rather than rapid ones. Its flight is swift and direct, though not sustained, with its tiny round wings creating a whirring sound as it moves from one bush to another. At night, particularly in winter, it may roost in snug holes or old nests, sometimes in groups for warmth.

Song & Calls

The Pacific wren's song is a defining characteristic, long and exuberant, used for both mating and territorial displays. Males have been observed to adapt their songs in noisy environments, such as near highways, to ensure their calls are heard.

Breeding

During the breeding season, the male Pacific wren constructs several "cock nests," but only one is selected and lined by the female for use. Nesting sites are varied, often tucked into natural crevices or man-made structures, and may contain five to eight white or speckled eggs. Breeding success and patterns can vary with altitude and urbanization, with some populations adapting to changes in their environment.

Similar Species

The Pacific wren was once considered conspecific with the eastern North American Troglodytes hiemalis and the Eurasian Troglodytes troglodytes, known as the winter wren. However, differences in song and genetics have led to its recognition as a distinct species.

Diet and Feeding

Primarily an insectivore, the Pacific wren forages on substrates like bark and fallen logs. Its diet consists mostly of insects and spiders, but in winter, it may also consume large pupae and some seeds.

Conservation Status

The Pacific wren is currently listed as Least Concern by the IUCN, indicating that, at present, there are no immediate threats to its population levels.

Pacific Wren Sounds


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