This yellow-brown seaweed grows in dense masses on the mid shore of sheltered rocky shores. It is identifiable by the egg-shaped air bladders that give it its name.

This black and grey solitary bee takes to the wing in spring, when it can be seen buzzing around burrows in open ground.

The common octopus is a highly intelligent, active predator. It even has a secret weapon - special glands produce a venom that it uses to incapacitate its prey!

Native oysters are a staple of our seas and our plates - but our love of their taste has lead to a sharp decline all around the UK.

This tiny wading bird is most often seen in autumn, feeding on the muddy margins of wetlands.

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.

Mae'r rhywogaeth yma o forwellt yn fath o blanhigyn blodeuol sy'n byw o dan y môr, gan ddarparu cynefin pwysig i lawer o rywogaethau prin a rhyfeddol.