Handbook of the Birds of the World
Celeus obrieni (top right); C. spectabilis (bottom left) C. spectabilis exsul (bottom right). Credit: del Hoyo, J., Elliott, A. & Sargatal, J. eds. (2002). Handbook of the Birds of the World. Vol. 7. Jacamars to Woodpeckers. Lynx Edicions, Barcelona.

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