Glossaryterritory
A territory is the land an animal lives on. One animal, a pair of the same animal, or a group of the same animal may live on this area of land. Animals defend this land if other animals try to enter. A group of tigers may live in the same area of land, but if another group of animals come to the land the tigers will defend their land.
Think of it this way- A stranger can't just walk into your home if they want to. Your parents would not let them in because your house is their territory, not a stranger's.