What does the disappearance of a species from all or part of its geographical range mean?

If the species has left its habitat because they used up all of their food resources, it is a natural instinct for them to wander in search of another area that offers them more opportunities to get food. Often, animal habitats are depleted or destroyed by human intervention. That is called habitat destruction. If the species has slowly died out and only a few are left, they are called an endangered species. If there are none of the species on the entire planet, they are extinct.