Hundreds of “stunningly beautiful” blue sea creatures have washed up along parts of the Welsh coastline.
Velella velella, commonly known as by-the-wind sailors and closely related to the Portuguese man o’ war, have been spotted on beaches across Anglesey, Gwynedd and Tenby.
One woman who found one of the free-floating hydrozoans on Tenby South beach said it was “like a crystal”.
Marine specialist Frankie Hobro, of Anglesey Sea Zoo, said the creatures were beautiful but warned people not to touch them due to their sting.
Nature lover Maxine Allinson was walking on Tenby South beach on Tuesday when she spotted a by-the-wind sailor for the first time.
The nickname – by-the-wind sailors – comes from their small sail-like structure, which catches the wind and moves them across the ocean surface.
Hobro said they were often mistaken for Portuguese man o’ war but were much smaller, “brighter blue” and “generally harmless”.
“So you get the kind of blue tides of the by-the-wind sailors and obviously if they catch the sunlight as well it really sparkles,” she said.
Hobro said by-the-wind sailors were relatively common, usually appearing in autumn and winter when ocean currents carry them long distances.
About 7cm long, they cannot move themselves and are often “dumped” ashore after storms or changes in currents.
Large groups strand together, she explained, because they travel in the same currents and are deposited along coastlines at the same time.
Similar to Portuguese man o’ war, by-the-wind sailors are colonies of animals related to sea anemones and corals, and they possess stinging cells.
Although their sting is generally considered “very mild” in comparison to Portuguese man o’ war, Hobro advised people not to touch them.
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