Chimney swifts are small birds with wing length averaging 130.4 mm and tail length averaging 39.1 mm. They weigh approximately 21 grams. The bird's body and head are dark grayish to brownish-gray color on the upper part, slightly paler below. The tail has stiff bristle-like or spiny feather tips. There may be as many as seven tail spines. The eyes of chimney swifts are large. In flight these birds are described as looking like a "cigar with wings." Male and female birds look the same.
Average mass: 21.33 g.
Sexual Dimorphism: sexes alike
Average mass: 22.8 g.
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