A special form of assembly in which members of a society are directed to some place where work is required.

A communication system that rallies nest mates to some particular place to aid in the defense of the colony: One example of an alarm-recruitment system is the odor trail method of lower termites, which is used to recruit colony members to the vicinity of intruders and breaks in the nest wall.

An odor trail laid by scout workers and used to recruit nest mates to a food find, a desirable new nest site, a breach in the nest wall, or some other place where the assistance of many workers is needed.