A Cub Scout is a member of the section of the worlwide Scouting movement for young persons, mainly boys normally aged 8–10. In some countries they are called Wolf Cubs and are often referred to simply as Cubs. The movement is often referred to simply as Cubbing. Originally, like the Boy Scouts, the Cubbing was for boys only; girls were expected to join the Brownies and then the Girl Guides or Girl Scouts. Since about 1990 the Cubs has been open to both girls and boys in several countries. In the USA, it is exclusively open for boys to join. Some countries also have a Sea Scout version of Cub Scouts.