Jeans are just blue denim cloth with some pockets sewn on. But at the Kamine Zoo in Japan, animals have helped MAKE jeans. The zoo took big rubber tires -- a favorite toy of big animals like lions and bears -- and wrapped them up in blue denim. Then they let the animals claw and chew away at them. Tigers tended to work alone; bears worked in pairs, and lions piled on in groups. When they were done chewing and scratching, the zookeepers rescued the torn, shredded cloth and sewed it into jeans. They sold the jeans to make money for the zoo. As you see in this video, the claw marks make you look like you rolled around in the lion's den yourself!