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A rock pooler has found a rare sea slug while searching around the coast of south Cornwall, BBC News reports.

Vicky Barlow was poking around the pools of Falmouth when she found the rainbow sea slug, usually found in warmer waters.

According to experts there have been only three previous sightings of the creature in the UK and this was the first in a rockpool.

The first sighting is thought to have been in 2022 off the Isles of Scilly.

"There have been a handful of sightings by divers and snorkelers since but, as far as we can tell, this is the first time this species has been found by a rock pooler in the UK," said marine biologist Dr Ben Holt of the Rock Pool Project.

The rainbow sea slug, or Babakina anadoni, is a member of the aeolid nudibranch family, which are characterised by their bright colours and unusual shapes, he said.

It is usually found in warm sea waters off the west coast of Spain, Portugal and France.

Spotting the sea slug was part of a pattern of "massive changes" in sealife seen around the South West over the last five years, Dr Holt told BBC News.

"It's an amazing find and I expect we will see more of them," he said.

"It is also quite remarkable because rock pools are quite a harsh environment with the tide going in and out."

Ms Barlow said she had been trying to find a spider crab on 6 May when she found the sea slug between Castle and Gyllyngvase beaches.

"It was a very low spring tide, which might explain why it was in a rock pool," she said.

"It was quite a discovery, they are absolutely beautiful and it shows that amazing species can be found in the UK."