Barnacle Goose
Branta leucopsis
The barnacle goose is a medium-sized goose, 55–70 cm (22–28 in) long, with a wingspan of 120–145 cm (47–57 in) and a weight of 1.21–2.23 kg (2.7–4.9 lb), with black legs and a small, stubby black bill. It has a white face and black head, neck, and upper breast. Its belly is white. The wings and its back are silver-grey with black-and-white bars that look like they are shining when the light reflects on it. During flight, a V-shaped white rump patch and the silver-grey underwing linings are visible.
ID text from Wikipedia, CC BY-SA 4.0

Nene
Branta sandvicensis
The nene is a large-sized goose at 41 cm (16 in) tall. Although it spends most of its time on the ground, it is capable of flight, with some individuals flying daily between nesting and feeding areas. Females have a mass of 1.525–2.56 kg (3.36–5.64 lb), while males average 1.695–3.05 kg (3.74–6.72 lb), 11% larger than females. Adults have a black head and hindneck, buff cheeks, and a heavily furrowed neck. The neck has black and white diagonal stripes. The adult's bill, legs, and feet are black.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Barnacle Goose and Nene.