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Taxonomy
John James Audubon is credited with having first described a specimen of the Bewick's wren, collecting the first known specimen in 1821. The Bewick's Wren is named after Audubon's friend Thomas Bewick, an English engraver and natural historian.

Description
The Bewick's wren has an average length of 5.1 inches (13 cm) and an average weight of 0.3 to 0.4 ounces (8 -12 g). Its plumage is brown on top and light grey underneath, with a white stripe above each eye. Its beak is long, slender, and slightly curved. Its most distinctive feature is its long tail with black bars and white corners. It moves its tail around frequently, making this feature even more obvious for observers.

Juveniles look similar to adults, with only a few key differences. Their beaks are usually shorter and stockier. In addition, their underbelly might feature some faint speckling. Males and females are very similar in appearance.

Vocalizations
Bewick's wrens, like many wrens, are very vocal. Both females and males make short calls while foraging and both use a harsh scolding call when agitated. Males also sing in order to attract mates and protect their territory; males can sing form 9 to 22 different songs. A male wren learns its song from neighboring males, so its song will be different from its father's.

Geographic Variation
Geographic differences have been observed in the appearance of the Bewick's wren. Eastern populations, prior to their decline, were described as being more colorful, such as having a reddish tint to its brown feathers. Pacific populations are described as being darker in appearance, while populations in the Southwest are described as having a grayer plumage.

Geographic differences have also been noted in the song of Bewick's wrens. Each regional population of Bewick's wrens have distinctive vocalizations, in particular their call notes. Pacific populations sing notably more complicated songs than Southwestern populations. Eastern populations were also noted to be excellent singers.

Distribution and habitat
The Bewick's wren once had a range that extended throughout much of the United States and Mexico and parts of Canada. It used to be fairly common in the Midwest and in the Appalachian Mountains, but it is now extremely rare east of the Mississippi River. It is still found along the Pacific Coast from Baja California to British Columbia, in Mexico, and in a significant portion of the Southwest, including Texas, Arizona, New Mexico, and Oklahoma. Western populations do not tend to migrate. Eastern populations, prior to their decline, used to migrate from its northern range to the Gulf Coast.

The preferred habitat of the Bewick's wren is that of open woodlands and brush-filled areas such as hillsides and uplands. They are more common than house wrens in drier habitats, such as those found in the Southwest. In California, Bewick's wrens inhabit a shrubland area called chaparral.

Feeding
Bewick's wrens are insect eaters. They glean insects and insect eggs from vegetation, including the trunks of trees. They typically do not feed on vegetation higher than 3 meters, but they will forage on the ground. Bewick's wrens are capable of hanging upside down in order to acquire food, such as catching an insect on the underside of a branch. When it catches an insect, it kills the insect prior to swallowing it whole. Bewick's wrens will repeatedly wipe their beaks on its perch after a meal.

Bewick's wrens will visit backyard feeders. They will eat suet, peanut hearts, hulled sunflower seeds, and mealworms. Like many insect-eating birds, the Bewick's wren widens its diet to include seeds in the winter.

Breeding
Courtship begins with the male singing from its perch. It will occasionally pause its song in order to chase its competitors. Bewick's wrens form monogamous pairs that will then forage together. The male wren begins building the nest in a cavity or birdhouse, with the female joining in later. The nest is constructed from twigs and other plant materials, and is often lined with feathers. The cup shaped nest is approximately 3 inches high and 5 inches in diameter. The female will lay 3 to 8 eggs. Bewick's wrens will sometimes have two or even three broods.

Status and conservation
In 2016, the Bewick's wren was listed as least concern on the IUCN Red List of threatened species due to the size of its range and estimates of its population size. However, ornithologists have noted a severe decline in its eastern range and parts of its western range. In particular, it has virtually disappeared from east of the Mississippi. In 1984, the state of Maryland classified the Bewick's wren as endangered under its Maryland Endangered Species Act of 1971. Despite this classification, no breeding pairs of Bewick's wrens are known to remain in Maryland. In 2014, the North American Bird Conservation Initiative placed the eastern Bewick's wren on its watch list.

Several theories have been proposed to explain its decline in its eastern range, including pesticide use and competition from other bird species. The most likely reason seems to be competition from house wrens. House wrens compete with Bewick's wrens for similar nesting sites. House wrens will destroy both the nests and eggs of Bewick's wrens. The reforestation of once open land has also negatively impacted the eastern Bewick's wrens.

In California, habitat loss due to development has impacted the Bewick's wren. In San Diego, the development of canyons has led to the gradual decline of native bird species, including the Bewick's wren.

In Washington, development has actually benefited the Bewick's wren, leading to an increase in its population. However, this has coincided the decline of the Pacific wren thanks to increased competition between the Pacific wren and the Bewick's wren.