Does bill size polymorphism affect courtship song characteristics in the African finch Pyrenestes ostrinus?
Haemopteus cyanomitrae sp. nov. (Haemosporida: Haemoproteidae) from a Widespread African Songbird, the Olive Sunbird, Cyanomitra olivacea
Adaptive significance of the mega-billed form in the polymorphic finch Black Bellied Seedcracker Pyrenestes ostrinus.