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Science 27 August 1971:
Vol. 173. no. 3999, pp. 818 - 821
DOI: 10.1126/science.173.3999.818
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Articles

Time, Energy, and Territoriality of the Anna Hummingbird (Calypte anna)

F. Gary Stiles 1

1 Department of Ornithóogy, American Museum of Natural History, New York 10024

The male Anna Hummingbird accommodates seasonal changes in energy demands by varying its allocation of time and energy among different activities; total energy expenditures change relatively little. Augmented terrritorial defense during the breeding season is made possible by increased feeding efficiency due to the availability at this time of very nectar-rich flowers.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Flight costs of long, sexually selected tails in hummingbirds.
C. J. Clark and R. Dudley (2009)
Proc R Soc B 276, 2109-2115
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Science. ISSN 0036-8075 (print), 1095-9203 (online)