Alexander, S.J.; McLaughlin, J.D.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1997)
Examination of the helminth communities in 25 yellow-billed ducks (Anas undulata), 21 red-billed
ducks (Anas erythrorhyncha), ten Cape teal (Anas capensis) and seven Cape shovellers (Anas
smithii) that had overwintered ...