The movie shows how the ant Camponotus sericeus recruits nestmates to newly discovered nesting sites by using the tandem running technique. All the essential behaviour patterns of Camponotus sericeus are documented: These include invitation behaviour, signal exchanges during tandem running and searching behaviour after a tandem pair was separated. Slow motion sequences 32 f/sec show in detail trail laying behaviour, tandem running and carrying behaviour. In addition the film includes dummy experiments which prove, that tandem running is organized by a combination of mechanical and chemical signals.