References

Calder, W.A. 1993. Rufous Hummingbird (Selasphorus rufus). In The Birds of North America, No. 53 (A. Poole and F. Gill, Eds.). Philadelphia: The Academy of Natural Sciences; Washington, DC.: The American Ornithologists’ Union.

Carpenter, F.L. and M.A. Hixon. 1988. A new function for torpor: fat conservation in a wild migrant hummingbird. The Condor 90:373-378.

Sauer, J.R., J.E. Hines, and J. Fallon. 2002. The North American Breeding Bird Survey. Results and Analysis 1966-2001. Version 2002.1, USGS Patuxent Wildlife Research Center, Laurel, MD.