Greylag goose the western greylag goose, breeds in Iceland and north and central Europe; "A. a. rubrirostris", the eastern greylag goose, breeds in Romania, Turkey and Russia eastwards to northeastern China. The two subspecies intergrade where their ranges meet. The greylag goose sometimes hybridises with other species of goose including the barnacle goose ("Branta leucopsis") and the Canada goose ("Branta canadensis"), and occasionally with the mute swan ("Cygnus olor"). The greylag goose was one of the first animals to be domesticated; this happened at least 3000 years ago in Ancient Egypt, the domestic breed being known as "A. a. domesticus". As the
Aleutian cackling goose Aleutian cackling goose The Aleutian cackling goose ("Branta hutchinsii leucopareia"), formerly known as the Aleutian Canada goose ("Branta canadensis leucopareia"), is small subspecies of cackling goose averaging 1700 to 2100 grams in weight. It was one of 122 species of animals, birds, and fish first documented for science by the Lewis and Clark Expedition (Corps of Discovery). The Bering cackling goose ("B. h. asiatica") is the name given to cackling geese on the Komandorski and Kuril Islands. This population was not markedly distinct from the Aleutian one and is usually included with them. By about 1920 or so (last seen