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.
American bison
Two subspecies or ecotypes have been described: the plains bison ("B. b. bison"), smaller in size and with a more rounded hump, and the wood bison ("B. b. athabascae")—the larger of the two and having a taller, square hump. Furthermore, the plains bison has been suggested to consist of a northern plains ("B. b. montanae") and a southern plains ("B. b. bison") subspecies, bringing the total to three. However, this is generally not supported. The wood bison is one of the largest wild species of bovid in the world, surpassed by only the Asian gaur and wild water buffalo. It is the heaviest, and second tallest extant land animal after moose in the Americas.