Common sexton beetle and mites
The common sexton beetle is so named because i its food supply is decaying flesh. There is a symbiotic relationship between the beetle and mites that it carries. When the beetle arrives at a dead animal corpse it lays its eggs which hatch they then feed on flesh, however they have to compete for this with fly larvae. The mites having hitched a lift with the beetle jump off and eat fly larvae improving the chances for the sexton larvae! Amazing !