A gross creature which gobbles up a fish's tongue and then replaces it with its own body has been found in Britain for the first time.
The bug - which has the scientific name cymothoa exigua - was discovered inside the mouth of a red snapper bought from a London fishmonger.
The 3.5cm creature had grabbed onto the fish's tongue and slowly ate away at it until only a stub was left.
It then latched onto the stub and became the fish's "replacement tongue".
Scientists are very excited by the find.
Dr Jim Brock of the Horniman Museum in south London told Metro newspaper: "I have not seen this species in all my 13 years at the museum so it's a remarkable find."
What the bug looks like
The bugs are usually found off the coast of California, so it's possible the fish was imported to the UK.
But don't be too freaked out - scientists say the creature does not pose any threat to humans and only attaches itself to fish tongues.