Cats can drink seawater.

Unlike humans, cats have kidneys that can filter out salt and use the water content to hydrate their bodies. (Yes, I know seawater doesn't come out of the toilet)

imgur.com

But they can’t taste sweet things.

Scientists believe that a mutation in a key taste receptor has prevented cats from being able to taste sugar. No cat will never know the joy of a cupcake.

Josh Norem / thefurrtographer.com