[Length 5.5 in. Wingspan 13.5 in.]

These Cliff Swallow nests were photographed at the Hot Springs, Big Bend National Park, Texas, USA. Photo taken with a AF-S VR Zoom-Nikkor 70-300mm f/4.5-5.6G IF-ED lens (EFL=450mm) on a Nikon D200 camera. (Date: December 12, 2010)

[Length 5.5 in. Wingspan 13.5 in.]

This Cliff Swallow at the nest was photographed at Yellowstone National Park, Wyoming, USA. Photo taken with a AF-S VR Zoom-Nikkor 80-400mm f/4.5-5.6G IF-ED lens on a Nikon D7100 camera. (Date: June 16, 2016)

[Length 5.5 in. Wingspan 13.5 in.]

This Cliff Swallow Nests was photographed at south Van Tassell Road, Van Tassell, Wyoming, . Photo taken with a AF-S VR Zoom-Nikkor 80-400mm f/4.5-5.6G IF-ED lens on a Nikon D7100 camera. (Date: July 07, 2018)

[Length 5.5 in. Wingspan 13.5 in.]

This Cliff Swallow gathering mud for nest building was photographed at Quivira NWR, Stafford, Kansas. Photo taken with a AF-S VR Zoom-Nikkor 80-400mm f/4.5-5.6G IF-ED lens on a Nikon D7100 camera. (Date: May 11, 2019)

[Length 5.5 in. Wingspan 13.5 in.]

This Cliff Swallow gathering mud for nest building was photographed at Quivira NWR, Stafford, Kansas. Photo taken with a AF-S VR Zoom-Nikkor 80-400mm f/4.5-5.6G IF-ED lens on a Nikon D7100 camera. (Date: May 11, 2019)

[Length 5.5 in. Wingspan 14 in.]

This Northern Rough-winged Swallow was photographed at the Convention Center gardens, South Padre Island, Texas, USA. Photo taken with a AF-S VR Zoom-Nikkor 80-400mm f/4.5-5.6G IF-ED lens on a Nikon D3200 camera. (Date: April 25, 2013)

[Length 5.5 in. Wingspan 14 in.]

This Northern Rough-winged Swallow was photographed at the prairie grasslands, Purple Springs, Alberta, Canada. Photo taken with a AF-S VR Zoom-Nikkor 80-400mm f/4.5-5.6G IF-ED lens on a Nikon D7100 camera. (Date: June 30, 2018)

[Length 5.5 in. Wingspan 14 in.]

This Northern Rough-winged Swallow was photographed along the Rio Grande River near McAllen, Texas, USA. Photo taken with a Nikkor 300mm EDAF f4.0 lens on Kodachrome 200 film. (Date: April 2000)