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.
Speckled mousebird
The speckled mousebird ("Colius striatus") is the largest species of mousebird, as well as one of the most common.