Staff at Blackpool Sea Life Centre have discovered evidence of a shark that they didn't even know they hadâ€¦
The existence of the shark first came to light when two eggs were found in a tank containing only livebearing species of shark.
According to a report by the BBC, the first egg was found in the ocean tank just before Easter, and a second three weeks later.
The 10cm/4" eggs have since been confirmed as coming from a carpet or bamboo shark, like the one pictured above.
It's thought that a former curator may have placed a juvenile carpet shark into the enormous half-a-million litre display aquarium and not recorded the fact. The shark then stayed hidden among the decor, out of sight of the larger sharks.
Staff say they would like to move the shark to another tank, along with a mate - if they can locate her.