Preuss's Swallow Petrochelidon preussi

A locally abundant swallow often seen around bridges, buildings, and culverts, where it constructs its mud nests. Distinctive cream-colored underparts contrast with its nearly uniform glossy blue upperparts. In flight, it has a noticeable pale rump and a short tail with white “windows” in the tail feathers. Rather unique within its range. Gives raspy calls in flight.