What a pleasant surprise! Two male orcas / killer whales were seen swimming together on our 13:00 tour on the last day of February 2019. They are not residents of the area and not really a common visitors either, although we see them a few times a year; in winter and most often again in summer. They tend to stay closer to the North of Snæfellsnes peninsula, about 2 hr. drive from Reykjavík, so seeing them on the South side is quite delightful!
"The killer whale or orca (Orcinus orca) is a toothed whale belonging to the oceanic dolphin family, of which it is the largest member. Killer whales have a diverse diet, although individual populations often specialize in particular types of prey. Some feed exclusively on fish, while others hunt marine mammalssuch as seals and other species of dolphin. They have been known to attack baleen whale calves, and even adult whales. Killer whales are apex predators, as no animal preys on them. A cosmopolitan species, they can be found in each of the world's oceans in a variety of marine environments, from Arctic and Antarctic regions to tropical seas, absent only from the Baltic and Black seas, and some areas of the Arctic Ocean. Killer whales are highly social; some populations are composed of matrilineal family groups (pods) which are the most stable of any animal species. Their sophisticated hunting techniques and vocal behaviours, which are often specific to a particular group and passed across generations, have been described as manifestations of animal culture." en.wikipedia.org/wiki/Killer_whale
Learn more about these fascinating creatures: elding.is/orca-killer-whale-orcinus-orca