A mysterious skull which appears to have no eye sockets has washed up on a beach in Lincolnshire sparking debate as to what kind of animal it might have belonged to.

The skull, which was discovered at the Gibraltar Point National Nature Reserve, was found by a woman who was walking her dog and picking up litter, according to the Lincolnshire Echo.

When she found the grisly specimen she reportedly “couldn’t believe her eyes”.

“I think it's definitely a washed up seal skull that's been bashed about by the tide,” the woman, who wishes to remain anonymous, said.

“The top part of the jaw is missing and the bottom jaw is out of place by the looks of it.”