The Razorbill (Alca torda) is the only living member of the genus Alca. It only comes to land in order to breed. This agile bird chooses one partner for life; females lay one egg per year. Razorbills nest along coastal cliffs in enclosed or slightly exposed crevices. Razorbills, guillemots and puffins do not compete directly for food because guillemots catch large fish, which they carry singly; puffins catch small fish and razorbills catch medium-sized fish. Razorbills usually nest in large colonies and lay their eggs on bare rock or ground.