Polly the African pancake tortoise is recovering at Bristol Zoo, after having an hour-long operation to save her life.
It was during a routine check up that vets at the zoo first discovered Polly was very poorly.
They x-rayed her, and found she had a bladder stone inside her, which could have killed her within weeks.
But a team of expert vets performed an operation to remove the stone, which was the size of a small egg!
Five-year-old Polly is now bandaged up and recovering well in the zoo's Reptile House.
CBBC Newsround | Pictures | Pics: Polly the pancake tortoise has surgery