Ashy Woodswallows are frequently seen perched on wires, often huddled in pairs or groups, as these two in Nakhon Ratchasima. They live in open areas with scattered trees, where they hunt and feed on insects. Despite its name it is not a true swallow.

Unlike swallows, it has a much thicker build, with broad-based, triangular, somewhat starling-like, pointed wings. Its plumage is a soft gunmetal gray, with pale greyish underparts, and a pale bluish bill.