Our seas and shorelines are home to a huge number of species, each one part of the marine ecosystem. We’re working to help people understand more about the importance of our oceans and the creatures that live in them.
Learn about our oceans
Use our guide to explore the diverse and beautiful wildlife of UK seas.
Share your wildlife sightings
MCS is interested in hearing about your wildlife sightings
of a number of different marine species - basking sharks, marine turtles and jellyfish in UK and Irish waters.
Cool Seas for children and teachers
Learn about our seas with the MCS Education Project.
More information and campaigns to get behind…
Cool Seas Poster
Our beautiful ‘cool seas’ poster shows some of the wildlife that make our oceans so special.Download the .pdf
Learn about turtles
Turtles, an ancient group of reptiles that witnessed the rise and fall of the dinosaurs … but now some marine turtle populations around the world really are in danger of extinction.Find out more
Alien Species Guide
Please use our guide to ‘alien species’ to help you identify wildlife that is not native to UK shores.Download the .pdf
Big Seaweed Search
Contribute to research by recording seaweed species found on your local shore.Find out how to take part
Learn more about jellyfish in our ‘Jellyfish Guide’.Download the .pdf
Explore the shore
If you like scouring the shoreline and have ever wondered at the natural treasures the tide brings in but aren’t quite sure what everything is, then our Seashore Safari Guide will reveal some of the secrets of the strandline.Download the .pdf
Did you know?…
Over 1,000 marine wildlife sightings were reported to MCS last year
Help protect marine wildlife
We need to secure £50,000 for the next two years to make the case for new Marine Protected Areas and survey existing sites to prove just how effective they are. Your support is vital in helping us make this happen.Donate now