Ashy woodswallows are usually seen in small groups. Several birds may sit huddled side-by-side on the bare branches of a tall tree, sometimes preening each other. They also perch on high vantage points such as powerlines and pylons. From their perches, they make aerial sallies, flapping and gliding to capture insects in the air. Insects may be caught in the beak, transferred and held in their feet, torn up with their bill and swallowed without returning to the perch. They may also return to the perch with prey to feed and will sometimes sit on the ground and have been known to visit bird baths. Although mainly feeding on insects, they may take nectar from flowers of trees such as "Erythrina". They have been recorded feeding on toxic butterflies of the family Danaiidae such as "Euploea core" which are avoided by other birds.