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Blackbilled.wh.duck.arp.pix. Blackbilled Whistling Duck Dendrocygna arborea photographed at Slimbridge Wildfowl and Wetlands Centre Gloucestershire England Taken by Adrian Pingstone en user Arpingstone in February and released to the public domain Arpingstone Dendrocygna arborea captive Birds in WWT Slimbridge