White-faced Whistling-Duck x Black-billed (West Indian) Whistling-Duck Dendrocygna viduata x Dendrocygna arborea

With several species of Whistling-Duck popular in captivity hybrids between them crop up from time to time.

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captive presumed White-faced Whistling-Duck x Black-billed Whistling-Duck, Blakeney Collection (Norfolk, UK), 6th October 2012

 

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captive Black-billed Whistling Duck (left) and White-faced Whistling-Duck (right), Blakeney Collection (Norfolk, UK), 6th October 2012 - the parents of the above hybrid perhaps?