Honey bee queen with mating sign at the end of her abdomen. After Woyke (1956, fig. 1) Anatomo-physiological changes in queen-bees returning from mating flights, and the process of multiple mating,
Bulletin de l'Academie Polonaise des Sciences
, Volume 4, p.81–87, (1956)
[1], Woyke (2011, fig. 3) The mating sign of queen bees originates from two drones and the process of multiple mating in honey bees,
Journal of Apicultural Research
, Volume 50, p.272-283, (2011)
[2].