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TOP 10 ANIMAL GROSS-OUTS : Cow

9. COW

There are over a billion cows on the planet, and if that number doesn't blow you away, maybe this will (literally): their grassy diet causes a methane build-up in the stomach, so cows are almost constantly leaking gas — from both ends. In fact, they can expel a half-gallon of gas every minute, but considering one cow can eat up to 90 pounds of food a day, the cause and effect make sense. Of course, just because the end result (pun intended) is logical doesn't mean it's going to smell any better!