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
Apus (genus) Linnaeus in 1758. The name "Apus" is Latin for a swift, thought by the ancients to be a type of swallow with no feet (from Ancient Greek α, "a", "without", and πούς, "pous", "foot"). Before the 1950s, there was some controversy over which group of organism should have the genus name "Apus". In 1801 Bosc gave the small crustacean organisms known today as "Triops" the genus name "Apus", and later authors continued to use this term. Keilhack suggested (in 1909) that this was incorrect since there was already an avian genus named "Apus" by Scopoli in 1777 . It was