Shocked staff at a sealife centre were amazed when they discovered something lurking in the tanks they didn't know about - a SHARK!
The workers at Blackpool's Sea Life Centre were baffled when two shark eggs were found in a tank - with sharks who usually give birth to babies!
Vets think that a small tropical carpet shark might have been added to the display, but no-one knew.
And because the shark likes lying still on the seabed, it hadn't been spotted.
Spokesman Martin Sutcliffe said: "The ocean tank is a massive half-a-million litre display with numerous dark nooks and crannies, and it is just feasible that a small shark could have stayed hidden."
They hope to find the female shark and move her to a smaller tropical tank with a mate.