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The smallest of our swallows, the Bank Swallow is usually seen in flocks, flying low over ponds and rivers with quick, fluttery wingbeats. It nests in dense colonies, in holes in dirt or sand banks. Some of these colonies are quite large, and a tall cut bank may be pockmarked with several hundred holes. Despite their small size, tiny bills, and small feet, these swallows generally dig their own nesting burrows, sometimes up to five feet long.

A small swallow of the west, nesting from Alaska to central Mexico. Similar to the Tree Swallow in appearance and also in behavior, nesting in tree cavities and in birdhouses; the Violet-green Swallow will also nest in rock crevices of cliffs in rugged terrain. Flocks are often seen flying high over mountain pine forests or over steep canyons.