The medium-sized swift is uniformly dark brown with slightly paler throat and upper breast. Inconspicuous spines extend past the web at tips of tail feathers.
Length: 5 inches
Wingspan: 12.5 inches
Sexes similar
Juvenile similar to adult
Small aerial bird with cigar-shaped body and crescent-shaped wings
Short tail bluntly squared off
Plumage sooty gray above with slightly paler rump
Buff throat darkening to sooty gray on belly
Underwings pale gray
Sound
Thier calls are chirpy and make a twittering song.