Razorbill (Alca torda) is a colonial seabird that comes to land only to breed. It chooses one partner for life and females lay just one egg per year.
Razorbills nest along coastal cliffs in enclosed or slightly exposed crevices. The parents spend equal amounts of time incubating. Once the chick has hatched, the parents take turns foraging for their young and sometimes fly long distances before finding prey.
Razorbills are distributed across the North Atlantic. The total world population of razorbills is estimated to be at less than a million breeding pairs, making them among the rarest auks in the world.