Tumbes Swallow

The Tumbes swallow is 11.5 to 12 cm (4.5 to 4.7 in) long and weighs about 11 g (0.39 oz). It is the smallest member of its genus. The sexes have the same plumage. Adults have a dark blue-brown to blue green head with a small white stripe from the base of the bill to above the eye and white cheeks and throat. Their upperparts, wings, and tail are dark blue-brown to blue green except for a white rump. Their underparts are white with thin bran-colored streaks on the breast. They have a dark iris, a stubby slate gray or black bill, and black legs and feet. Voice: As of December 2025 xeno-canto had only four recordings of Tumbes swallow vocalizations and the Cornell Lab of Ornithology's Macaulay Library had five with no overlap. "The mellifluous churtle of breeding Tumbes Swallow is barely audible, but beautiful to the ear." Its call while foraging is "a dry, rising zhreet?".