Blue jellyfish
Often confused with the larger but similarly shaped lion’s mane jellyfish, the blue jellyfish can be colourless when young and develop a striking blue-purple bell as it matures.
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Lion's mane jellyfish
The long mane of tentacles that stream out from the lion's mane jellyfish is stunning… literally! Look but don't touch when it comes to these jellyfish - they give a powerful sting.
Barrel jellyfish
Giants of the jellyfish world, these incredible creatures are the UK’s largest jellyfish! They can grow to the size of dustbin lids – giving them their other common name: dustbin-lid jellyfish.…
Compass jellyfish
It's easy to see where the compass jellyfish got its name – its brown markings look just like a compass! They may look beautiful – but they give a nasty sting so keep your distance.
Mounts Bay Marine Trail
Journey along the Mounts Bay Marine Trail and explore the iconic coast path through Newlyn, Penzance and Marazion. Discover the interactive features and find out about the history, wildlife and stories of the bay.
Discover Cornwall’s colourful marine wildlife with National Marine Week!
Cornwall Wildlife Trust is celebrating Cornwall’s extraordinary marine life with two full weeks of fun and inspiring marine events across the county as part of National Marine Week, which runs…
The Wildlife Trusts' 2024 marine review
The Wildlife Trusts’ marine highlights of 2024 includes ambitious nature recovery projects, new species records and spectacular sightings around our shores, all happening here in Cornwall.
Record year for Cornwall’s Marine Wildlife
Over 2,500 records, representing tens of thousands of animals, were sent into Cornwall Wildlife Trust’s Seaquest Southwest Project in 2016 – a record breaking year for the initiative as described…
The Wildlife Trusts’ marine highlights and challenges of 2023
Sensational bait ball spectacles at sea, new marine protection and hope for whales and bluefin tuna: The Wildlife Trusts' marine review 2023
The Wildlife Trusts’ 2025 marine review
A year of disasters, discoveries and determination around UK shores
Record-breaking ocean temperatures raise alarm for Cornwall’s marine wildlife
Record-breaking ocean temperatures are harming Cornwall's marine wildlife. Cornwall Wildlife Trust is advocating for Marine Protected Areas to help ecosystems build resilience against climate…
Wildlife in Cornwall
Find out more about the wildlife that surrounds you and what you can do to help by visiting our species explorer.