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
Branta rhuax determining the affinities so precisely and that the relationships of the bird would remain doubtful until further specimens were obtained. Branta rhuax Branta rhuax is an extinct goose endemic to the Hawaiian Islands. It was initially described into the monotypic genus "Geochen" but assigned to "Branta" by Storrs L. Olson in 2013 after reexamination of the subfossil material. The bird was described in 1943 by Alexander Wetmore from subfossil remains originally discovered in 1926, in the course of a public works excavation of a water supply tunnel. The bones were found at a depth of 25 m beneath a prehistoric