When a boy leaves a Bear den to enter a Webelos den, he is entering a new part of Cub Scouting.  His uniform will change, he will face different advancement requirements, and he will have new experiences with camping. 

Webelos Den Meeting
Webelos Scouts work on activity badges in one of 20 different interest areas at each of the den meetings.  Den meetings also include games, songs, stunts, preparation for teh Webelos den's part in the pack meeting, and work on other advancement requirements.  In addition, Webelos Scouts have opportunities for overnight campouts and joint activities with a Boy Scout troop.  One of the purposes of Webelos den is to prepare the boys for Boy Scouts and to graduate them into a troop.