Inbreeding: the breeding of closely related individuals. An inbred population usually has less genetic variability and this is generally disadvantageous for its long-term survival and success.
del Hoyo, J., Elliot, A. and Sargatal, J. (1996) Handbook of the Birds of The World. Volume 3, Hoatzin to Auks.Birdlife International and Lynx Edicions, Barcelona.