Mae gwylogod yn gwybod yn iawn sut i fyw bywyd ar ymyl y dibyn – yn llythrennol! Maen nhw’n nythu wedi’u gwasgu’n dynn at ei gilydd ar glogwyni a siliau serth o amgylch yr arfordir. Efallai bod…

This little cuttlefish really lives up to its name - it only reaches about 6cm long!

Hornwrack is often found washed up on our beaches, with many believing that it is dried seaweed. In fact, it is a colony of animals!

This gentle giant is the largest shark in UK seas, reaching up to 12m in length. There's no need to fear them though, they only eat plankton!

The spiny spider crab lives up to its name in every way! Their distinctive spiny shells are often found washed up on beaches.

The moon jelly is the most common jellyfish in UK seas, often washing up on our beaches. No need to worry though - it doesn't sting humans.

Their empty, delicate pink or yellow shells can often be found washed up on beaches, but the animals themselves live buried in the sand all around the coasts of the UK.

Sometimes called 'Marsh samphire', wild common glasswort is often gathered and eaten. It grows on saltmarshes and beaches, sometimes forming big, green, fleshy carpets.