Ashy-headed Goose
Chloephaga poliocephala
The ashy-headed goose is 50 to 60 cm (20 to 24 in) long. Males weigh 1.62 to 2.27 kg (3.6 to 5.0 lb) and females 1.47 to 1.49 kg (3.2 to 3.3 lb). Adults have the same plumage. Their heads and necks are gray, their upper back and breast chestnut with fine barring, their flanks barred black and white, and their belly white. In flight their blackish wings show bold white leading and trailing patches and a metallic green speculum. Their bill is black and the legs and feet orange with black markings. Voice: Male and female ashy-headed geese have different vocalizations: Males make "soft, wigeon-like whistles" and females "harsh cackling notes".
ID text from Wikipedia, CC BY-SA 4.0
Ruddy-headed Goose
Chloephaga rubidiceps
The ruddy-headed goose is 45 to 52.5 cm (18 to 21 in) long. Males weigh 1.65 to 2.02 kg (3.6 to 4.5 lb) and females 1.20 to 1.50 kg (2.6 to 3.3 lb). Adults have the same plumage. Their heads and necks are red-brown, their back, breast, and flanks gray and buff with brown barring, their belly cinnamon, and their tail black. Their wing's upperside is gray and the underside gray, black, and white. Their bill is black and the legs and feet orange with black markings. Juveniles are similar to adults but duller overall. Voice: Male and female ruddy-headed geese have different vocalizations: Males make a "short, whistled 'seep'" and females a "short rasping quack".
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: Ashy-headed Goose and Ruddy-headed Goose.