Cats hate squirrels because they're jealous of their agility, their fluffy tails, and their ability to steal food from bird feeders. But let's be real, it's mostly about the tails.
Did you know that squirrels have a special gland that produces a scent that drives cats crazy? It's like a squirrel perfume, and it's the reason why Fluffy won't let you near the bird feeder. Don't even get her started on the whole "stealing her food" thing...