Download A Red Bird in a Brown Bag: The Function and Evolution of by Geoffrey E. Hill PDF

By Geoffrey E. Hill

This can be an account of reports of the functionality and evolution of colourful plumage in the home Finch. it's also a fascinating research at the evolution of sexual choice in birds and a full of life portrait of the demanding situations and constraints of experimental layout dealing with any box investigator operating with animal habit. half I units the level for contemporary reviews of the functionality of plumage shade with a overview of the 19th and starting of the 20th centuries. half II makes a speciality of the proximate regulate and current functionality of plumage color. half III takes a extra explicitly evolutionary method of the learn of plumage colour utilizing biogeography and phylogeny to check hypotheses for why particular types of plumage colour exhibit have advanced. It concludes with an account of comparative stories which were performed in the home Finch and different cardueline finches and the perception those experiences have supplied at the evolution of carotenoid-based decorative shade.

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Extra info for A Red Bird in a Brown Bag: The Function and Evolution of Colorful Plumage in the House Finch (Oxford Ornithology Series)

Sample text

After young leave the nest, however, the male alone feeds and cares for the fledglings while the female builds another nest and lays another clutch of eggs. In some cases, the female leaves chicks to the exclusive care of the male before chicks have fledged, and she begins building a new nest. 8 days. The longest it took a female to initiate a second nest was 24 days, while the minimum was —4 days. This latter female had four eggs in a second nest before young fledged from the first; the male alone fed the young during their last few days in the nest.

During these late summer/early fall months, adult birds become scarce at our feeding stations. We only occasionally capture adults during banding from July to September, and I have also had trouble capturing adult House Finches at feeding stations in August in California and Ontario. In contrast, hatch-year birds come into feeding stations in large numbers from July through September. It appears that hatch-year birds from a local area stage at feeding stations for several weeks before they disperse to the area in which they will breed.

Early in the season it is common to observe a male and female associating as a pair during a morning's observation but then never to see them together again. My colleagues in animal behavior, who work diligently not to corrupt their observations of animals with anthropomorphic A R E D B I R D I N A B R O W N B A G 31 biases, will cringe, but to me these short associations seem equivalent to dates in humans. Birds are attracted to one another initially and associate for a time, but either the male or the female switches to a different partner before a strong pair bond is established.

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