Every evening the cliff swallows return to their mud nests, filling the canyon with a chorus of chattering wings.

A cliff swallow perched on a sun-warmed ledge, its mud gourd of a nest tucked into a crevice where the colony returned each evening.

American cliff swallows returned to the river bluff and fed their chicks at dawn.

During the summer, an American cliff swallow built its mud nest beneath the highway overpass.