Northern Rough-winged Swallow

Identification

The northern rough-winged swallow is a small swallow measuring 13–15 cm in length with a wingspan of 27–30 cm and weighing just 10–18 g. Adults are brown above with white underparts, a small bill, and a distinctly forked tail. The throat is white with a brownish-grey wash, distinguishing it from some similar species. The name "rough-winged" refers to the serrated edge feathers on the wings—a feature only visible when the bird is held in hand. Males have longer, broader undertail coverts and hooked barbs on their outer primary wing feathers, while females have shorter, straighter barbs. Juveniles can be identified by their reddish-brown wing-bars. Though similar to bank swallows, rough-winged swallows have a dusky throat and breast. They are closely related to the southern rough-winged swallow, but that species has a more contrasting rump and their ranges do not overlap.

Range & Habitat

The northern rough-winged swallow is native across a wide range from southern Alaska and Canada through the United States, Mexico, and Central America to Panama, with populations also found in Caribbean islands including the Bahamas, Cuba, Jamaica, and Puerto Rico. The species has been recorded at elevations up to 2,500 m in Costa Rica. Migratory populations in the US and Canada typically winter in southern Florida and from southwestern Mexico to Panama, while populations in Mexico and further south are largely non-migratory, though local post-breeding movements occur.

Behaviour & Diet

Northern rough-winged swallows typically nest in burrows in soil banks, and occasionally in caves, trees, or human-made cavities such as gutters and tubes. These burrows, usually excavated by other species, range from 20 to 200 cm in length but typically measure 30–100 cm. Nests are built by the species from grasses, leaves, rootlets, twigs, bark, pine needles, moss, and dung, then lined with grass—materials collected almost entirely by females. The birds usually nest solitarily, though sometimes in loose groups of up to 25 pairs, often at the edges of bank swallow colonies. The breeding season generally extends from May to mid-July, varying by region; in northeastern North America it begins mid-May, while in the northwest it starts in early June, with both regions ending in August. In southern parts of the range, breeding occurs earlier, from mid-April to mid-May in Costa Rica. The call is a short, harsh zeep or rough, low bzzt, often doubled and similar to that of the bank swallow.

Best Time & Places to See It

The northern rough-winged swallow is best observed during the breeding season from May through mid-July across North America and into Central America. Look for them in areas with exposed soil banks, particularly near water where they hunt for insects in flight. The best locations include regions along rivers, streams, and eroded banks from Canada and the northern United States southward through Mexico and Central America to Panama. In winter, focus on southern Florida and the southwestern US, with populations extending to Central America through Panama.

Photography Tips

Photographing northern rough-winged swallows presents challenges typical of small, fast-moving birds. Look for them perched near their nesting sites on banks and cliffs, where you may capture them at rest or as they enter and exit burrows. Early morning and late afternoon often provide the best light and activity levels. Their aerial insect-hunting behavior can yield dynamic action shots, though this requires fast shutter speeds and tracking skills. The brownish-grey throat wash and subtle plumage details are easier to capture in clear sunlight. Patience near active nesting colonies during the breeding season offers the best opportunities for close views and behavioral photography.