Dating and mating reading the body language signals
In social seabirds, the preen gland is used to mark nests, nuptial gifts, and territory boundaries with behavior formerly described as 'displacement activity'. For example, ants mark their paths with pheromones consisting of volatile hydrocarbons.
Certain ants lay down an initial trail of pheromones as they return to the nest with food.
Pheromones also exist in plants: Certain plants emit alarm pheromones when grazed upon, resulting in tannin production in neighboring plants.The pheromone requires continuous renewal because it evaporates quickly.When the food supply begins to dwindle, the trail-making ceases.They proposed the term to describe chemical signals from conspecifics that elicit innate behaviors soon after the German biochemist Adolf Butenandt had characterized the first such chemical, bombykol, a chemically well-characterized pheromone released by the female silkworm to attract mates.There are physical limits on the practical size of organisms employing pheromones, because at small sizes pheromone diffuses away from the source organism faster than it can be produced, and a sensible concentration accumulates too slowly to be useful.