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Both species are usually found in warm waters more than 4,000 miles away around Florida and Mexico.
It became stranded on the shore at the Tan-Y-Foel beach on the Menai Straits at Angelsey, North Wales – and has been named Menai by experts looking after it was the Angelsey Sea Zoo.
A spokeswoman for the Sea Zoo said: “The Kemp’s ridley turtle is a critically endangered species, being the rarest sea turtle in the world, and the Olive ridley turtle is also extremely rare, and has never previously been recorded as stranding in the UK.