\[ **keywords:** #Pheromones #Communication ] --- > [!cite] Citation > Wyatt, Tristram D. ‘Pheromones’. *Current Biology*, vol. 27, no. 15 (7 August 2017), R739–R743. https://doi.org/10.1016/j.cub.2017.06.039. > [!abstract] > The reality of invisible chemical signals, pheromones, between members of the same species was recognized long before they could be identified. Charles Darwin proposed that the breeding season sexual smells of male crocodiles, goats and other animals, too, could have evolved by sexual selection of the smelliest males through female choice. But it’s not just sex. We now know that pheromones are used by species all across the animal kingdom, in every habitat, and in a wide range of biological contexts, from trail, alarm, and queen pheromones in social insects to the mammary pheromone produced by mother rabbits. Pheromones have provided fascinating examples of signal evolution. In some model organisms, such as moths, *Drosophila*, *Caenorhabditis elegans*, and *Mus musculus*, a complete signaling system can be genetically dissected, from the enzymes producing pheromones, perception by chemosensory receptors, through to the neural circuits processing the signals. --- ‘Many bioassays measure a behavioural response as in the … suckling of a rabbit pup in response to the rabbit mammary pheromone, 2-methylbut-2-enal’ [[Wyatt, ‘Pheromones’, 2017|(Wyatt 2017, R740)]]. ^42e1ce ‘… male Agrotis moths do not respond to female sex pheromone for up to 24 hours after mating’ [[Wyatt, ‘Pheromones’, 2017|(Wyatt 2017, R740)]]. ^838284 ‘Even though pheromone still stimulates the olfactory sensory neurons in the male moth’s antennae, the brain response is blocked until enough time has elapsed for the male to have replenished his accessory protein stores to go with his sperm’ [[Wyatt, ‘Pheromones’, 2017|(Wyatt 2017, R740)]]. ^872055