Description
The Ruby-crowned Kinglet is a very small bird, being 9 to 11 centimeters (3.5 to 4.3 in) long, having a wingspan of 16 to 18 centimeters (6.3 to 7.1 in), and weighing 5 to 10 grams (0.2 to 0.4 oz). It has gray-green upperparts and olive-buff underparts. It has two white wingbars and a broken white eye ring. The wingbar on the greater secondary coverts (closer to the wing-tip) is wider, and is next to a dark band. The kinglet has a relatively plain face and head, although the male has a scarlet-red crown patch, which is usually concealed by the surrounding feathers. The crown patch is rarely orange, yellow, or not present. Females are identical to males (except for the crown). Immature birds are similar to adult females, since young males lack a crown patch. The kinglet usually moves along branches or through foliage with short hops, and flies with bursts of rapid wing beats. It is constantly active, and is easily recognized by its characteristic wing-flicking. Its flight has been described as "swift, jerky, and erratic".
Compared to the related Golden-crowned Kinglet, the Ruby-crowned Kinglet is slightly larger, more elongated, and has greener plumage. The bird can be mistaken for the Hutton's Vireo, which also displays wing-flicking, though less frequently than the kinglet. It can also be mistaken for the Dwarf Vireo in Mexico. However, both of the vireos are larger, have stouter bills and legs, and lack the kinglet's black bar on the wings.
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