[Length 11 in. Wingspan 24 in.]

This Common Pauraque was photographed at Laguna Atascosa NWR, Rio Hondo, Texas. 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: January 10, 2019)

[Length 7.75 in. Wingspan 17 in.]

The Common Poorwill is the only bird known to go into an extended state of torpor (like hibernation) so it can survive several weeks or months without eating. During the winter when food is scarce, it can slow its metabolic rate to lower its body temperature as low as an amazing 41° Fahrenheit, and reduce its oxygen consumption by more than 90%! Native Americans of the Hopi tribe were probably aware of the this behavior, as the Hopi word for the bird, hölchko, means "The Sleeping One". This Common Poorwill was photographed at Cave Creek Canyon, Arizona, USA. Photo taken (by flashlight!) with a Nikkor 300mm ED f4.5 lens on Ektachrome 200 film. (Date: May 1985)

[Length 14 in. Wingspan ?? in.]

This Common Potoo was photographed at Metropolitan Park, Panama City, Panama. Photo taken with a AF-S VR Zoom-Nikkor 70-300mm f/4.5-5.6G IF-ED lens (EFL=420mm) on a Nikon D300 camera. (Date: August 6, 2011)

[Length 7.25 in. Wingspan 18 in.]

This Black Swift on the nest was photographed at the waterfall at Box Canyon Park, Ouray, Colorado, 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 27, 2016)

[Length 7.25 in. Wingspan 18 in.]

This Black Swift on the the nest was photographed at Box Canyon Park, Ouray, Colorado, 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 28, 2016)

[Length 5.25 in. Wingspan 14 in.]

This Chimney Swift in flight was photographed in central New Jersey, USA. Photo taken with a Nikkor 300mm ED f4.5 lens on Kodachrome 200 film. (Date: May 1990)

[Length 6.5 in. Wingspan 15 in.]

This White-throated Swift was photographed in the foothills of the Rocky Mountains just west of Denver, Colorado, USA. Photo taken with a Nikkor 300mm ED f4.5 lens on Ektachrome 400 film pushed to 800. This photo is on file with the Academy of Natural Sciences' Visual Resources for Ornithology (VIREO B22/1/006). (Date: June 1986)

[Length 9.75 in. Wingspan 19 in.]

This Eastern Whip-poor-will was photographed at an unknown location, Alamo, Texas. Photo taken with a Canon EOS 10D camera (lens unknown). (Date: April 07, 2011)