The New Zealand grey duck (Pārera) is a subspecies of Anas superciliosa. While the species is considered secure over its range, it is in decline in New Zealand. The major source of decline is competition and hybridisation with the mallard.

The mallard occupies much the same habitat as the grey duck, and is a strong competitor. Hybridisation is also causing a decline in gray ducks as they will mate with mallards also.

I took this photo in the aviary at Rainbow Fairy Springs

Native Grey Duck or Pārera

In contrast, the female mallard (in the wild)