It is rare for any species of animal to regularly kill its own in combat. However, male Dawson’s bees, one of the world’s largest bee species, are so aggressive that they kill each other en masse in a bid to mate with females.
The bees enter a frenzy of fighting, and by the time their deadly combat is over, every male bee is either killed or has perished. The extreme behaviour, which can lead to even females being killed, is caught on film by a BBC natural history crew.
Dawson’s bees (Amegilla dawsoni) are large burrowing bees that nest in the baked soil of the Australian outback.
ETA: Amegillas form a genus of large bees that has around 250 species. Some of its members are important agricultural pollinators in Australia and other tropical and sub-tropical areas. The blue-banded bee uses vibration to obtain pollen (buzz pollination). The beautifully named teddy bear bee is also a species of amegilla.