Anser albifrons; White-fronted geese are passage migrants. They spend the winters on the British isles and breed on Greenland. During spring and autumn they a while on Iceland, mainly in the western and south-western grassland regions. In the spring of 2013 I saw a lot of them around Borgarnes. Characteristally they have a - as the English name suggests - a white spot on the base of their beaks. They resemble the Grey-lag Goose. Next to the white coloured base of the beak they often have distinct very dark (black) patches on their flanks and breasts.