Cliff Swallow nests.

Cliff Swallow in mud nest

A series of cliff swallow nests were under the overhang of the Visitor’s Center at the wildlife refuge.

Barn Swallows

Cliff swallow nest (building in progress)

Cliff Swallows take up occupancy each summer at an 8 story office of the General Motors Technical Center.

More than 100 nests were built by Cliff Swallows. These photos document their return.

Cornell Lab of Ornithology

Cornell Lab of Ornithology