Many bumblebee species have been observed to use pheromones in the process of brood recognition. In the species Bombus vosnesenskii, brood recognition, and subsequently, brood clump incubation, has been shown to be pheromone induced. Queens will deposit chemical signals on a brood clump to help herself and her workers identify the eggs. However, these pheromones appear to be species' specific, as opposed to specific to individual queens, as queens will also incubate the eggs of conspecific bees.