The long thought figure of 100 billion neurons for humans has been disproven. The correct number is 86 billion. Dogs have 2.25. billion. Cats have 0.75 billion. I think that it is safe to say that dogs exhibit more behaviors than cats, but cats are brilliant at being cats. Ants only have 7 thousand. The house fly has 100 thousand, bees have 960 thousand, while cockroaches and praying mantises have 1 million.