Cats, belonging to cats, are widely used pets in families all over the world. The ancestors of domestic cats are supposed to be desert cats in ancient Egypt and Persian cats in Persia. It has been domesticated by humans for 3500 years. It kills other animals by ambush, and most animals climb trees. Cats have fat pads at the bottom of their toes to avoid making noise when walking and not scaring away mice when hunting. When walking, the claws are in a contracted state to prevent them from becoming dull and protruding when catching mice and climbing.