Beachgoers have been left stunned when they found a mysterious sea creature with a transparent body washed ashore on a beach on the island of Menorca in Spain.
Mobile phone footage shows a curious tourist poking the jelly-like slug with a plastic pole.
It doesn’t appear to have any form while it remains stationary on the sand.
The gelatinous creature belongs to the family of common salp and is a primitive creature called a colonial tunicate.
But unlike jellyfish, it is harmless to humans.
The salps are also considered filter feeders and they eat microscopic plants.
Experts from local non-government organisation GOB Menorca said the salps are fragile, harmless animals.
Volunteers have previously found the large specimen seen in the photos on Pregonda beach on the island.
A GOB Menorca spokesperson said: “Salps do not have tentacles and they are harmless and very fragile so if you ever come across one, do not disturb it.”
However, swimmers can still “enjoy seeing their slow movements underwater from a safe distance”.
The NGO said on Facebook: “This creature, which looks like something straight out of a sci-fi movie, is actually closer, in evolutionary terms, to humans than jellyfish.”
They also said that salps “play an important role in combating climate change as they absorb large quantities of carbon dioxide and expel it in the form of tiny faecal balls”.
“An average colony is estimated to eliminate 4,000 tons of carbon dioxide in one night,” they added.
GOB Menorca said: “At sea, they can be found individually or as part of a colony of thousands that stretch to around 1.5 kilometres in length.”