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
Red-breasted Goose
Branta ruficollis
All the species of the genus Branta are distinguished by their dark sooty colour, relieved by white, and as a distinction from the grey geese of the genus Anser. This bird measures 53–56 cm (21–22 in) in length, 1.16–1.35 m (3.8–4.4 ft) in wingspan. It is sexually dimorphic, with males being slightly heavier than females, weighing 1.2–1.62 kg (2.6–3.6 lb) and 1.05–1.13 kg (2.3–2.5 lb), respectively. This brightly marked species is unmistakable, but can be surprisingly difficult to find amongst brant geese. At long distances, the red of the breast tends to look dark.
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: Nene and Red-breasted Goose.