The Gray-rumped Swift (Chaetura cinereiventris) lives in Nicaragua, Panama, Colombia, Venezuela, Argentina, and Brazil. It is seen in flocks of 20 over forests, open habits, or waterways in wet lowlands. Adults are 10 cm (4 inches) in height and 18 g in weight.
This small bird has a pale gray rump and throat. Matures are mostly glossy black, with sides of head and neck gray slate. Feet and bill are black. This bird eats flying ants, bees, wasps, beetles, and flies.