| Literature DB >> 17812193 |
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.Entities:
Year: 1971 PMID: 17812193 DOI: 10.1126/science.173.3999.818
Source DB: PubMed Journal: Science ISSN: 0036-8075 Impact factor: 47.728