Wilkinson, D, James, T. J, Gammon, N. E, Sneap, D, Stone, C. W, Dummigan, N. P, Chatfield, D. G. P, Kramer, D, King, B & Oliver, P. J / January 1985 – vol. 78, issue 1, pp 42–50 Hybrid resembling Ring-necked Duck. On 18th March 1984, a Ring-necked Duck Aythya collaris was reported from Tottenhill Gravel-pits, Norfolk. N. Bostock, myself and others went to see it. At about 150m it resembled a male Ring-necked Duck, but at closer range in good light a number of features pointed to its being a hybrid Tufted Duck A.fuligula X Pochard A.ferina. Its size, shape and structu... This article is only available to registered users.To read more, please log in or purchase a subscription.