Poisonous jellyfish Portuguese Men O' War invade Spanish waters
One of the world's most poisonous jellyfish, the Portuguese Man O'War, has been spotted off the coast of Spain for the first time in a decade.
This means that they will settle in these waters now, meaning holidaymakers might have trouble enjoying a swim in the sea as these creatures do have a potentially lethal sting in their long tentacles.
Scientists predict that they could also end up in the waters around the Balearic Islands and the Catalan Coast, as it could be the beginning of a colonisation process, where a creature finds a new place to live due to climate change affecting where they used to stay and breed.
Their sting is 10 times stronger than a normal jellyfish, and even if they wash up on the beaches, they can be deadly because their tentacles retain their poison.
If a person is stung, it will leave red, whip-like welt on the skin and will last for a few days, although the pain should subside after about an hour. Only if the tentacles wrap around a person's neck and cause an allergic reaction to the lungs and throat can a sting be fatal however. If someone is stung, doctors recommend washing the area with salt water and applying ice.
"Climate change is changing the migration patterns of many creatures. If they establish themselves it would be very worrying because they really are very dangerous," Xavier Pastor, the European director of the Oceana ecological campaigning group, told the Independent.