Regardless of age level, a den should consist of six to eight boys or six to eight girls. Dens are either all-boy or all-girl. In many packs, there will be one or more dens for each grade level: Tigers, Wolves, Bears, Webelos, and Arrow of Light. A smaller pack might combine first- and second-year Webelos Scouts. Lions and Tigers always have their own den because of their unique program structure. Dens of more than eight members are not encouraged.
The pack supports each den by offering pack meetings and activities throughout the year. Pack leaders also smooth the transition from one level of Cub Scouting to the next (or, in the case of second-year Webelos Scouts, from a pack to a troop).