Why are hyenas useful? Watch and read the Caption

It is true that most people do not like hyenas, but these hyenas are very useful for nature and other living things.
Now, the carcass that you see is the remains of a lion hunt or ... that can no longer be eaten by other animals, and it is only the hyena that eagerly begins to eat this carcass. And without these hyenas, this carcass can cause thousands of diseases for other animals.