Polymorphism and the evolution of a continuous breeding season in the pigeon, Columba livia.
D000818:Animals; D005075:Biological Evolution; D001835:Body Weight; D001947:Breeding; D010856:Columbidae / Q000502:physiology*; D004739:England; D005260:Female; D008027:Light; D008297:Male; D008548:Melanosis / Q000662:veterinary; D009929:Organ Size; D010507:Periodicity; D010641:Phenotype; D011110:Polymorphism, Genetic; D012621:Seasons; D013737:Testis / Q000502:physiology; D014507:Urbanization