The Rock Pool Project in Plymouth says the non-native sea hare looks "alien-like".

The alien-like creature is known as Aplysia depilans, or the 'Mediterranean sea hare', a species rarely seen in the UK.

A young rock-pooler discovered a rare ‘alien-like’ winged creature washed up on a UK beach. Charley Taviner, five, was following a crab when he found what he thought was a huge lump of seaweed. But it ...