Each Cub Scout works towards earning badges. The Den structure allows the Scouts to be more focused on the badges to be achieved.
First badge earned: Bobcat Badge. This is the first badge earned by a boy upon joining Cub Scouts. Additional badges are earned as he advances through the various ranks of Cub Scouts. Those ranks are, in order of progression, Tiger, Wolf, Bear, and Webelo. See the table below for details on each of these ranks.
To
move to the rank of Tiger, the Cub Scout must complete the Bobcat
requirements, which include demonstrating his understanding of
Scouting's core values. The Scout must also be able to recite the Cub
Scouts Promise, Law of the Pack, and motto and demonstrate the Cub
Scouts sign, handshake, and salute. He must also explain what each of
these ideals means, in addition to demonstrating his understanding of
the core values of honesty and trustworthiness, and explaining their
importance. Source for the Bobcat requirements is the Tiger Handbook.