Diadasia rinconis mating scramble
In a large aggregation, hundreds or thousands of male Diadasia rinconis bees patrol the area where females nest, and they compete fiercely for the chance to mate with females that emerge, forming “mating balls,” in which multiple males grapple with each other and attempt to secure a female. (Video credit: Bruce Taubert. Video originally published supplementary to Russell et al 2018, Journal of Insect Science.)