There's no animal that has zero mass. But it could be close to zero if we're thinking about an ant or we're thinking about a dust mite or maybe if you consider even a bacterium an animal. I believe bacterium is a singular of bacteria. And it could go all the way, maybe the most massive animal in the zoo is the elephant of some kind. I don't know what it would be in kilograms but it would be fairly large. So maybe you can get up all the way to 3,000 kilograms or probably larger. Say 5,000 kilograms.