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1. The Arctic Skuas of Fair Isle 2. Numbers and distribution 3. Feeding behaviour and ecology 4. Breeding ecology 5. Genetics 6. Demography and selection 7. Sexual behaviour 8. Sexual selection 9.… (More)
Darwin (1859) gave a concise definition of sexual selection and its mechanism: “This depends, not on a struggle for existence, but on a struggle between the males for possession of the females; the… (More)
The males of some animals possess a number of characters that may have evolved because they are preferred by females in mating. Some of these characters are exaggerations of corresponding female… (More)
On February 1, 1898, a very severe snowstorm hit New England. A number of English sparrows, presumably exhausted in the storm, were brought to the Anatomical Laboratory of Brown University in… (More)
Sexual selection, whether by female preference or male competition, is almost inevitably frequency-dependent. Female preference gives rise to a ‘rare male effect’, by which the rarer male phenotypes… (More)
Three main factors probably determine the effectiveness of Batesian mimicry. They are the frequency of the mimic, the degree of distastefulness of the model and the degree of perfection of the mimic.… (More)