Why is Cat's pee so smelly?

Have you ever wondered why your Neko-chan(pet cat) pee so smelly? I did, just one week ago when the boy cat peed by livingroom's windows. I barely had time to react, all in a sudden, the room is smelled like rotten rate house.

So, Why Cat's pee is way more smelly than human?

A Japanese research team in Rikagaku Research Institute and Iwate University, gave out their answers.

In human's case, only when a person is having kidney dieases, the pee will be consisted of large porton of protein, however, in cat's case, even when a cat is healthy, his/her pee will be filled with protein. Among the protein, one kind of amino acid is extremely smelly.

To know more, check out the Japanese report here.