The grey duck (Anas superciliosa superciliosa), also known as Parera (Maori), is an endemic dabbling duck, being the New Zealand subspecies of the Pacific black duck.

Grey duck were commonly found in shallow wetlands and fresh water streams, and occasionally in estuaries throughout New Zealand up until the 1950s. Since the introduction of the mallard duck, they have suffered severely from this new 'competitor' as well as through loss of habitat. Introduced mallards have taken over from grey duck, comprising 80 percent of New Zealand's dabbling duck population today.