Leatherback Turtle Sightings

Leatherback Turtles in British Waters: Gentle Giants of the North Atlantic

Imagine seeing a creature that looks like a marine relic from a prehistoric ocean—only metres from the UK’s rugged coastline.

That’s the magic of spotting a leatherback turtle (Dermochelys coriacea) in British waters, an event both thrilling and ecologically significant.

These magnificent reptiles are among the most extraordinary marine visitors to grace our seas.

Who Are the Leatherback Turtles?

Leatherback turtles are true ocean wanderers.

Unlike other sea turtles with hard shells, they have a flexible, leathery carapace—the trait that gives them their name.

These giants can grow up to 2.5 metres (8 ft) long and weigh several hundred kilograms, making them the largest of all living turtles. Their range spans the globe’s oceans, from tropical nesting beaches to cool temperate seas.

What truly sets leatherbacks apart is their remarkable physiology: they can metabolically warm parts of their bodies, allowing them to thrive in waters much colder than other sea turtle species can tolerate—an essential adaptation for life in the North Atlantic.

Leatherbacks and British Seas: A Seasonal Visit

Each summer and autumn, leatherbacks are known to migrate into UK and Irish waters, most often drawn by plentiful jellyfish blooms, their favourite food.

Although sightings aren’t common year-round, their presence is impressive, especially considering the chilly temperatures of British seas.

According to long-term marine records, leathery shells have been recorded all around the UK’s west and south-west coasts, from Scotland down to Cornwall, following abundant jellyfish patches carried with seasonal currents.

Across multiple UK and North Atlantic monitoring datasets there have been roughly ~2,000 recorded turtle events (sightings, strandings, bycatch) in UK & Irish waters over the 20th–21st century.

80–85% of all UK turtle records are leatherbacks

The clearest pattern from UK/OSPAR monitoring datasets is:

Peak occurrence: June → October

Highest frequency: August

There is also the possibility of strong clustering in late summer jellyfish blooms.

Recent Sightings & News: A Rare Delight

There have been some exciting recent reports of leatherback activity around UK waters:

In the summer of 2025, several people along the southwest coast near Devon filmed and reported a leatherback turtle swimming close to shore, pausing to feed on clusters of jellyfish.

The footage was shared with conservation groups and sparked both awe and interest in these nomadic reptiles.

Another report from the same period described people watching a giant turtle cruising offshore off East Devon, even swimming alongside paddleboarders before continuing its journey out to sea.

There was also a stranded leatherback found at Porthleven, Cornwall, in September 2025, thought to be linked to an earlier entanglement in fishing gear.

These sightings highlight that, although seasonal, these turtles still capture imaginations whenever they grace British waters.

Why Leatherbacks Matter

Leatherback turtles are classified as vulnerable to extinction, with some populations critically endangered.

They face numerous threats across their global range, from accidental capture in fishing gear to plastic pollution, which they often mistake for jellyfish.

In the UK, they are recognised as a significant marine species, and while only leatherbacks are seen annually with any regularity, six turtle species have been recorded in British seas over long-term records.

Monitoring sightings is vital—not just for science but for conservation action. Charities like the Marine Conservation Society urge the public to report all turtle encounters so trends can be better understood and protective measures improved.

Spotting and Reporting Leatherbacks: How You Can Help

If you’re lucky enough to see a leatherback around the UK coast:

Keep your distance. They’re wild animals and should not be disturbed.

Do not attempt to touch or bring them aboard boats.

Record where and when you saw the turtle, and share your sighting with organisations like the Marine Conservation Society’s Turtle sightings programme.

Every piece of data helps build a picture of how these incredible animals are using British waters—and how climate change, ocean conditions, and jellyfish availability influence their patterns.

Final Thoughts

The leatherback turtle remains one of the most awe-inspiring marine visitors to the UK—ancient, enigmatic, and beautifully adapted to life at sea.

Their seasonal journeys into cooler waters remind us of the connectivity of the world’s oceans and the importance of protecting vital marine habitats.

Whether you’re along the Cornish cliffs or exploring Devon’s coves, keep an eye on the waves—you never know when one of these gentle giants might glide into view.

For the latest annual records, check mcsuk.org

Learn ⁠more about:

Basking Sharks

Dolphins

Harbour Porpoise

Where to see dolphins in Cornwall

Reporting stranded marine life in Cornwall

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