Owl: If you eat voles, you can be a forest cleaner.

Woodpecker: Woodpeckers can eat insects on trees and be forest cleaners.

Vultures and vultures: Vultures and vultures eat the carcasses of various animals. They eat so much that only bones and fur are left in a few minutes. In this way, vultures and vultures can keep the forest clean and reduce or even avoid the spread of germs and diseases.

Earthworms: It can treat some harmful substances in forest soil. Loosen the soil and provide nutrition for the forest.