(1989): A guide to the birds of Costa Rica. Comistock, Ithaca. Bio One 2005-07-25 Cornell University News Service Rare South American bird 'sings' with its feathers to attract a mate, Cornell researcher finds Bird "Sings" Through Feathers on National Geographic club-winged manakin Birds of the Colombian Andes Birds of the Ecuadorian Andes club-winged manakin club-winged manakin