Ruby-crowned Kinglet

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The ruby-crowned kinglet (Regulus calendula) is a very small passerine bird found throughout North America. It is a member of the kinglet family. The bird has olive-green plumage with two white wing bars and a white eye-ring. Males have a red crown patch, which is usually concealed. The sexes are identical (apart from the crown), and juveniles are similar in plumage to adults. It is one of the smallest songbirds in North America. The ruby-crowned kinglet is not closely related to other kinglets, and is put in its own subgenus, Corthylio. Three subspecies are currently recognized.

The kinglet is migratory, and its range extends from northwest Canada and Alaska south to Mexico. Its breeding habitat isspruce-fir forests in the northern, mountainous, United States and Canada. The ruby-crowned kinglet builds a cup-shapednest, which may be pensile or placed on a tree branch and is often hidden. It lays up to 12 eggs, and has the largest clutch of any North American passerine for its size. It is mainly insectivorous, but also eats fruits and seeds. source

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