Fishermen have found a breed of fish that can remove testicles with their teeth.
Pacu Fish
The 20cm-long fish, a piranha-like amphibian named Pacu, was pulled out of a lake in the central park of a Russian town called Tula.
But on closer inspection, the fish have teeth like humans - so sharp that the fisherman who made the finding strongly believe it could rip off a man's testicles with a single bite - so they've nicknamed it Nut Cracker.
City spokeswoman Varvara Trunova said: ''The fish has been confiscated from the fisherman and sent for examination. According to the preliminary findings the Pacu fish is 20cm long and weighs 240 grams.''
Experts think the exotic fish may have been abandoned in the lake by their owners when it grew too large.
Now concerns are growing over the likelihood that the fish have been dumped together and began breeding.