| Torpidity in the White-throated Swift, Anna Hummingbird and Poorwill. |
| Only 31 species have been documented to use burrows of desert tortoises, including two birds, the common poorwill and burrowing owl. |
| This is similar to the breeding period for the Ocellated Poorwill and for Blackish Nightjars in western Brazil. |
| We also used playbacks of poorwill and Great Horned Owl vocalizations to examine whether the proximity to a potential predator influences calling responses by poorwills. |
