Cliff Swallow

The Cliff Swallow is a highly social swallow best known for its enormous nesting colonies and its distinctive jug- or gourd-shaped mud nests. Adults show a dark chestnut throat and face, a pale buffy or whitish forehead patch, a steel-blue crown and back, and a warm buffy-orange rump that is especially conspicuous in flight.

Unlike Barn Swallow, the Cliff Swallow's tail is squared off rather than deeply forked, giving it a stockier, more compact silhouette in flight.

Key field marks

• Square (not forked) tail
• Buffy-orange rump patch, conspicuous in flight
• Dark chestnut throat and face
• Pale, whitish or cream forehead patch
• Steel-blue crown and back

Similar species

Barn Swallow has a deeply forked tail, dark (not pale) forehead, and lacks the buffy rump patch. Cave Swallow (limited range overlap in the southern U.S.) is similar but has a paler, buffier throat and a chestnut (not pale) forehead — range and forehead color are the key distinctions.

Habitat

Nests colonially on vertical surfaces near open foraging habitat: natural cliff faces and canyon walls, and increasingly on human structures such as bridges, overpasses, dams, and building eaves, always with mud and water sources nearby for nest construction.

Range

Breeds across most of North America, from Alaska and Canada south through the United States into Mexico. A long-distance migrant, it winters in southern South America. Famously associated with Mission San Juan Capistrano in California, where colonies historically returned each spring, inspiring the phrase "when the swallows come back to Capistrano."

Behavior

One of the most colonial landbirds in North America, Cliff Swallow colonies can range from a handful of nests to several thousand tightly packed together on a single structure, offering protection from predators through sheer numbers and vigilance.

Voice

A constant low, squeaky, chattering babble rises from active colonies; individual calls include a soft, grating "churr."

Feeding and nesting

Feeds on flying insects, often foraging in loose flocks high over open country. Builds an enclosed, gourd-shaped nest entirely from hundreds of individually carried mud pellets, plastered to a vertical wall under an overhang, with a narrow tubular entrance — one of the most architecturally elaborate nests of any North American songbird.