Andean Goose
Chloephaga melanoptera
The Andean goose is 70 to 76 cm (28 to 30 in) long and weighs 2.73 and 3.64 kg (6.0 and 8.0 lb). Both sexes have the same plumage. Adults' heads and bodies are white. Some scapulars have sooty centers and others are dark brown, giving a striped appearance to the shoulders. The wing's primaries and the tail are black with a greenish gloss. Their bill is coral red with a black nail and the legs and feet are light red. Downy young are mostly white with some blackish spots and streaks. Older immatures are similar to adults but duller. Voice: The Andean goose is very vocal, and males and females have very different voices. Males make "a "soft huit-wit-wit..., crip, quiop, low, grunting kwwwwwu..., single-syllable threat whistle, and double-syllable sexual calls." Females make a louder "somewhat grating kwa-kwak and "a hoarse gack-gack".
ID text from Wikipedia, CC BY-SA 4.0
Kelp Goose
Chloephaga hybrida
The kelp goose is 55 to 65 cm (22 to 26 in) long. Males of the nominate subspecies weigh 2.54 to 2.58 kg (5.6 to 5.7 lb) and females 2.00 to 2.02 kg (4.4 to 4.5 lb). Subspecies C. h. malvinarum is heavier: Males weigh 3.25 to 3.60 kg (7.2 to 7.9 lb) and females 2.05 to 2.80 kg (4.5 to 6.2 lb). The two subspecies have the same plumage but the sexes are completely different. Adult males are entirely white but for a black bill with a pink spot on the maxilla and yellow legs and feet. Adult females have a pale brown crown and chocolate brown head, neck, and mantle. Voice: Male and female kelp geese have different vocalizations: Males make a "whistled 'si-si-si'" and females "low honking 'arnk-arnk', 'ooer' or 'ooeroo' calls". Very young chicks make "a double-noted 'cheep'."
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: Andean Goose and Kelp Goose.