Some bats—another variety of small, nectar-binging mammals—are even more impressive heavyweights. In 2010, a team of researchers set up an airborne obstacle course and fed bats a mixture of sugar water and ethanol. Even after blowing (or technically, licking) BACs of up to 0.3, which would leave a human unconscious or dead, the animals had no trouble dodging dangling plastic chains or sending out echolocation calls. If your food supply is boozy, researchers in both studies concluded, then evolution will speed your metabolic mechanisms accordingly. "If being drunk makes you more prone to dying," Jenson says, "that same selective pressure is going to also create animals that can really hold their liquor."