Mosquito
Mosquitoes of the genus "Toxorhynchites" never drink blood. This genus includes the largest extant mosquitoes, the larvae of which prey on the larvae of other mosquitoes. These mosquito eaters have been used in the past as mosquito control agents, with varying success.
Megachile pluto
Megachile pluto, also known as Wallace's giant bee, is a very large Indonesian resin bee. It is the largest known living bee species. It was believed to be extinct until its rediscovery in 1981.