描述
"The greylag goose (also spelled graylag in the United States), Anser anser, is a bird with a wide range in the Old World. It is the type species of the genus Anser. The greylag is the largest and bulkiest of the grey geese of the genus Anser. It has a rotund, bulky body, a thick and long neck, and a large head and bill. It has pink legs and feet, and an orange or pink bill.[2] It is 74 to 91 cm (29 to 36 in) long with a wing length of 41.2 to 48 cm (16.2 to 18.9 in). It has a tail 6.2 to 6.9 cm (2.4 to 2.7 in), a bill of 6.4 to 6.9 cm (2.5 to 2.7 in) long, and a tarsus of 7.1 to 9.3 cm (2.8 to 3.7 in). It weighs 2.16 to 4.56 kg (4.8 to 10.1 lb), with a mean weight of around 3.3 kg (7.3 lb). The wingspan is 147 to 180 cm (58 to 71 in). Males are generally larger than females, with the sexual dimorphism more pronounced in the eastern subspecies rubirostris, which is larger than the nominate subspecies on average."