you can find interesting facts about cats.

Example : 

Cats "paw" to mark their territory. Cats sweat through the bottom of their paws and rub off the sweat as a marking mechanism.

Cat’s paws also contain scent glands, and the scent, mixed with the sweat from their paws, is used to mark their territory while they’re engaged in walking, kneading and scratching behaviors. In addition to marking their territory, cats use scratching posts and other surfaces to hook their claws in deep to allow them to engage in a full body stretch.

Enjoy.