General · 16 September 2026

Giant lion's mane jellyfish spotted off Welsh coast

Iestyn Morgan, a 21-year-old freediver, captured footage of a massive lion's mane jellyfish on Monday, close to Trefin Beach in Pembrokeshire. He estimated the jellyfish was about 10 to 15 metres long, comparing its size to a bus or small train. Marine biologist Dr Cathy Lucas said the sting is nasty but not dangerous, advising people not to touch them.

By BriefTea Editorial · 16 September 2026 at 10:16

Reported by BBC · How we write briefs

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What are lion's mane jellyfish? Why are they called 'lion's mane'? Why are they in Welsh waters?

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