They are often aggressive in numbers less than five, and are known fin nippers. Males usually have visible bulges of white muscle protruding from the joint of the nippers. In the summer months Coledale Lifesaving Club runs Nippers every 2nd Sunday on Coledale Beach. Jan Juc has a Surf Life Saving Club which includes a junior "Nippers" program. Several partly constructed Nippers were transferred to Castle Donington. The focus for Nippers tends to be on fun, and surf awareness. Nippers start to compete when they are in the Under 8s age group. The club has memberships for patrolling adults, children's nippers, youth rookies and associate supporting members. Nippers learn about safety at the beach. In November 1965, the Club created its Nippers group. In 2000, about 45 Nippers were still active, mostly in the UK. The youth arm of the clubs is known as Nippers, and holds similar events. Nationally there are 61,604 junior members, or Nippers as they are more commonly known.