Richard Klim
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Hennessey 2011. Species rank of Phibalura (flavirostris) boliviana based on plumage, soft part color, vocalizations, and seasonal movements. Wilson J Ornithol: 123(3): 454-458. [abstract]
Ridgeley & Tudor 2009 (Birds of S America: Passerines) recognises Phibalura boliviana Palkachupa Cotinga, citing Bromfield et al 2004:
- Bromfield, Ritchie, Bromfield, Ritchie & Hennessey 2004. New information on plumage, nesting, behaviour and vocalisations of the Bolivian Swallow-tailed Cotinga Phibalura flavirostris boliviana from the Apolo area of Madidi National Park, Bolivia. Cotinga 21: 63-67. [pdf]
Geographically isolated race boliviana rather distinctive, may represent a separate species.
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