http://www.iol.co.za/scitech/science/environment/mallards-could-wipe-out-sa-s-ducks-1.1840678#.VSPCB-aUfPQ

April 2 2015 - Melanie Gosling 

Cape Town – Mallard ducks, an aggressive alien species, could wipe out South Africa’s indigenous ducks if left unchecked, experts say.

Mallards, introduced for sport hunting, are popular as pets and “ornamental” waterbirds. However, in a bid to save local waterfowl from extinction, the Department of Environmental Affairs...


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