
Blue-and-White Swallow (Pygochelidon cyanoleuca)
Photographed in the village of San Luis near the southwestern shore of Lake Arenal, Costa Rica on Nov 8, 2014.

Blue-and-White Swallow (Pygochelidon cyanoleuca) Pair
Photographed in the village of San Luis near the southwestern shore of Lake Arenal, Costa Rica on March 25, 2009.

Northern Rough-winged Swallow (Stelgidopteryx serripennis)
Photographed along Nations Road near Geneseo, NY on May 2, 2015.

Northern Rough-winged Swallow (Stelgidopteryx serripennis)
Photographed at Cape May, NJ on May 2, 2012.

Purple Martin (Progne subis) Female and Hatchling
Photographed at Cape May Point State Park, NJ on May 1, 2012. The tiny object in the opening of the nest cavity is a newly hatched Purple Martin.

Tree Swallow (Tachycineta bicolor) Emerging from Nest Box
It was emerging from the nest box at Chimney Bluffs State Park in Wayne County in western New York State on May 9, 2007.

Tree Swallow (Tachycineta bicolor) Nestlings Peering from Nest Box
Photographed at the Sandra L. Frankel Nature Park in Brighton, NY on July 2, 2017. Map

Tree Swallow (Tachycineta bicolor) Arriving at Nest Box to Feed Nestling
Photographed at the Sandra L. Frankel Nature Park in Brighton, NY on July 2, 2017. This is the same nest box shown in the previous photo. Map

Tree Swallow (Tachycineta bicolor) Feeding Nestlings at Nest Box
Photographed at the Sandra L. Frankel Nature Park in Brighton, NY on July 2, 2017. This is the same nest box shown in the previous photo. Map

Tree Swallows (Tachycineta bicolor) in Huge Flight
This huge flock in fall migration was photographed at Cape May, NJ on Oct 7, 2008.

Bank Swallow (Riparia riparia) Nestlings
This film photo of nestlings still in the nest, but already in their adult plumage, was made at Coast Guard Beach, Cape Cod National Seashore, MA in August…