Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.
Pycnonotus nieuwenhuisii was not recognised in BirdLife International (2000, 2001) owing to an understanding that conclusive evidence was being produced of its hybrid origin. However, this evidence, published in Williams (2002) fails to elucidate how its distinctive (and consistent) plumage could realistically be derived from the purported parents or other species of Pycnonotus within its geographic range. Therefore, taking a precautionary approach the BirdLife Taxonomic Working Group continue to recognise nieuwenhuisii as a valid species although the need for further field and molecular work is acknowledged.
Collar, N. J.; Crosby, M. J.; Stattersfield, A. J. 1994. Birds to watch 2: the world list of threatened birds. BirdLife International, Cambridge, U.K.
del Hoyo, J.; Elliott, A.; Christie, D. 2005. Handbook of the Birds of the World, vol. 10: Cuckoo-shrikes to Thrushes. Lynx Edicions, Barcelona, Spain.
Williams, R. S. R. 2002. The rediscovery and doubtful validity of the Blue-wattled Bulbul Pycnonotus nieuwenhuisii. Forktail: 107-109.
Text account compilers
Benstead, P., Symes, A., Taylor, J.
Duckworth, W., Williams, R.
IUCN Red List evaluators
Butchart, S., Symes, A.
BirdLife International (2014) Species factsheet: Pycnonotus nieuwenhuisii. Downloaded from http://www.birdlife.org on 09/03/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 09/03/2014.
This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.
To provide new information to update this factsheet or to correct any errors, please email BirdLife
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|Current IUCN Red List category||Data Deficient|
|Species name author||(Finsch, 1901)|
|Population size||Unknown mature individuals|
|Distribution size (breeding/resident)||56,600 km2|
|Links to further information|
|- Additional Information on this species|