The first beavers found living in the wild in England for 500 years, will be allowed to stay where they are.
The animals, on the River Otter in Devon in south west England, can remain in the wild, as long as they're free of disease.
Beavers were hunted to extinction in England five centuries ago, because their fur and oil were very valuable.
This is the first time permission's been given to re-introduce a mammal previously extinct in England.
Martin's got the story.
Read more: Beavers back in the wild in England