American Black Duck vs Pacific Black Duck

American Black Duck

Anas rubripes

Large1.2 kgWetland

The American black duck weighs 720–1,640 g (1.59–3.62 lb) and measures 54–59 cm (21–23 in) in length with a 88–95 cm (35–37 in) wingspan. This species has the highest mean body mass in the genus Anas, with a sample of 376 males averaging 1.4 kg (3.1 lb) and 176 females averaging 1.1 kg (2.4 lb), although its size is typically quite similar to that of the familiar mallard. The American black duck somewhat resembles the female mallard in coloration, although the black duck's plumage is darker.

ID text from Wikipedia, CC BY-SA 4.0

Photo: scaup · CC BY 4.0

Pacific Black Duck

Anas superciliosa

Large883 gWetland

This sociable duck is found in a variety of wetland habitats, and its nesting habits are much like those of the mallard, which is encroaching on its range in New Zealand. It feeds by upending, like other Anas ducks. It has a dark body, and a paler head with a dark crown and facial stripes. In flight, it shows a green speculum and pale underwing. All plumages are similar. The size range is 54–61 cm (21–24 in); males tend to be larger than females, and some island forms are smaller and darker than the main populations.

ID text from Wikipedia, CC BY-SA 4.0

Photo: (c) Tim, some rights reserved (CC BY), uploaded by Tim · cc-by

Photos and recordings are credited to their authors under the licence shown. Full profiles: American Black Duck and Pacific Black Duck.