 For example, aggressive display behaviour in the crayfish "Orconectes virilistends" to be triggered by impositions of other crayfish on previously established territory.Such displays consist of a preliminary raising of claws between 4 and 5 times and if this is not sufficient to warn the other to not encroach on the territory then tactile engagement will occur.In this case, display behaviour is a preliminary step to the engagement of aggressive tactile behaviour whereas many cases of display behaviour result in the engagement of mating rituals.