A Cub Scout is a participant in the Cub Scout training program operated by many Scouting organizations for young persons, mainly boys aged about 7 to 11. In some organizations they are known by their original name of Wolf Cubs or simply as Cubs. The program is often referred to simply as Cubbing. Originally the Cubs program was open only to boys; girls were expected to join the Brownies. Since about 1990 the Cubs has been open to both girls and boys in several countries, but in the United States, it is still exclusively for boys. A few organizations also operate a Sea Cub version of Cub Scouts.