2. A substance that emits a sweet smell or scent; a perfume; especially, incense, spice, ointment, etc.; also, an odoriferous flower.
3. A smell or scent, whether pleasant or unpleasant.
By smelling the colony odor of another member of the same species, an insect is able to determine whether it is a nest mate.
Certain insects; for example, honey bees and some ants, can orient themselves toward their nests by means of the odor.
It is possible that the nest odor is the same as the "colony odor" in some cases. The nest odor of honey bees is often referred to as the "hive aura" or "hive odor".
The odorous material is referred to either as the "trail pheromone" or the "trail substance".
It is possible that the species odor is merely the less distinctive component of a larger mixture comprising the colony odor (the odor found on the bodies of social insects).