Territorial behavior is the methods by which an animal, or group of animals, protects its territory from incursions by others of its species. An important part of territorial behavior is also marking territory. Territory can be marked by sounds, smells, and more. If these preliminary markings do not discourage entrance into territory then chasing and fighting of various sorts may follow. But there are many different kinds of territories that animals may mark. Animals may mark territories for feeding, nesting, mating, pairing, roosting, winter, or various combinations of these factors. Territorial behavior is not seen so often in withering animal populations. However, the behavior is useful in many ways. Having a territory promotes animal mating without interruption, hinders overcrowding, and creates an area for adults and young to hunt for food without outside competition. In the picture above a dog is peeing to mark his territory. The dog first sniffs out where other dogs have peed on the grass and then pees over their pee in other to mark his territory.