Time, Energy, and Territoriality of the Anna Hummingbird ( Calypte anna )
- 27 August 1971
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 173 (3999), 818-821
- https://doi.org/10.1126/science.173.3999.818
Abstract
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.Keywords
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