228 
THE WILSON JOURNAL OF ORNITHOLOGY • Vol. 123, No. 2. June 2011 
Clark, C. J. and T. J. Feo. 2010. Why do Calypte 
hummingbirds “sing” with both their tail and their 
syrinx? An apparent example of sexual sensory bias. 
American Naturalist 175:27-37. 
Feo, T. J. and C. J. Clark. 2010. The displays and 
sonatinas of the Black-chinned Hummingbird (Trochi- 
lidae: Archilochus alexandri). Auk 127:787-796. 
Hamilton, W J. 1965. Sun-oriented display of the Anna's 
Hummingbird. Wilson Bulletin 77:38-44. 
Hurly. T. A.. R. D, Scott, and S. D. Healy. 2001. The 
function of displays of male Rufous Hummingbirds. 
Condor 103:647-651. 
McGuire, J.. C. C. Witt, D. L. Altshuler, and j. V. 
Remsen, 2007. Phylogenetic systematics and bioge¬ 
ography of hummingbirds: Bayesian and maximum 
likelihood analyses of partitioned data and selection of 
an appropriate partitioning strategy. Systematic Biol 
ogy 56:837-856. 
McGuire, J. A., C. C. Witt, .1. V. Remsen, R. Dudley, and 
D. L. Altshuler. 2009. A higher-level taxonomy for 
hummingbirds. Journal of Ornithology 150:155-165. 
Mitchell, D. E. 2000. Allen's Hummingbird (Selasphorus 
sasin). The birds of North America. Number 501. 
Pitelka, F. A. 1951. Ecologic overlap and interspecific 
strife in breeding population of Anna and Allen 
hummingbirds. Ecology 32:641-661. 
Powers. D. R. 1987. Effects of variation in food quality on 
the breeding territoriality of the male Anna's Hum¬ 
mingbird. Condor 89:103-11 J. 
Stiles, F. G. 1972. Age and sex determination in Rufous 
and Allen hummingbirds. Condor 74:25-32. 
STILES. F. G. 1983. Systematics of the southern fonn of 
Selasphorus (Trochilidac). Auk 100:311-325. 
Tamm, S. 1985. Breeding territory quality and agunulic 
behavior: effects of energy availablity and intruder 
pressure in hummingbirds. Behavioral Ecology and 
Sociobiology 16:203-207. 
Tamm. S„ D. P. Armstrong, and Z. J. Toiffi. 
1989, Display behavior of male Calliope Hum¬ 
mingbirds during the breeding season. Condor 91: 
272-279. 
Temei.es, E. J. and W, J Kress. 2010. Mate choice and 
mate competition by a tropical hummingbird at a floral 
resource. Proceedings of the Royal Society of London. 
Series B 277:1607-1613. 
Wole, L. L. 1976. Avifauna of the Cerro de la Muerte 
region Costa Rica. American Museum Novitates 
2606:1-37. 
Wolf, L. L., F. G. Stiles, and F. R. Hainsworth. 1976. 
Ecological organization of a tropical highland hum¬ 
mingbird community. Journal of Animal Ecology 
45:349-379. 
