What is an area that occupied and defended by animal or a group?

The term you're looking for is territory.

Here's why:

* Territory is a specific area that an animal or group of animals claims and defends as their own.

* It can be used for various purposes, including:

* Finding food and resources: Animals defend their territory to ensure access to food, water, and shelter.

* Raising young: Territories provide a safe and secure environment for raising offspring.

* Mating: Animals often use their territories to attract mates and deter rivals.

* Avoiding predators: Having a territory can provide some protection from predators, especially if the territory is well-known and defended.

Examples:

* A lion pride defending a patch of savanna.

* A bird defending its nest and surrounding area.

* A pack of wolves marking and patrolling their hunting ground.

Let me know if you have any other questions!