The Gyrfalcon is not a common breeding bird in Iceland so seeing one is always a treat. Estimated number of breeding pairs is 300. They are more common in the North but can be spotted all over the country. Their numbers are determined by the numbers of Ptarmigan which is their main food although they hunt most birds.
The two Gyrfalcon siblings that I came across had killed a Pink-footed Goose and were busy eating it. They did not want to leave their prey which made photographing them not to difficult.