The white neck spot variant in the European green-winged teal and the yellow-billed teal

Harrison, J.M.; Harrison, J.G.

Bull Brit Ornithol Club 78(6): 104-105

1958


Accession: 025977371

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Abstract
The presence of a white spot situated anteriorly on the lower neck of the drake European green-winged teal Anas crecca crecca is now known to be a not uncommon variant, but it's precise incidence still has to be worked out. The authors believe that this character is of evolutionary significance, perhaps representing a reversion towards the white neck ring occurring commonly in the mallard Anas platyrhynchos platyrhynchos, which is certainly a closely related sp. Additional evidence for this theory is supplied by a specimen of an immature drake yellow-billed teal Anas flavirostris flavirostris from the Faulkland Islands which also exhibits a white neck spot.