The hedgehog sponge is commonly found on the south and west coast, on rocks that are still under shallow water at low tide.
Up to 10cm (4in) wide.
Often to be seen fluttering over seaweed-covered rocks and patrolling seawalls and jetties, turning stones and seaweed in search of food.
Britain’s most common blenny is often found in rockpools or under rocks on the shore line, and varies in colour from grey to brown. Up to 13cm (5in) long.
4) Beadlet anemone
Look out for their familiar red or green blobby bodies on rocks at low tide. These unfurl to reveal waving tentacles when the tide comes in.
5) Velvet swimming crab
With a smooth, velvety shell up to 6cm (2¼in) wide, these distinctive crabs hide in crevices on sheltered rocky shores. Watch out – they have a nasty nip.
6) Hermit Crab
Commonly found in rockpools, hermit crabs make their home in periwinkle shells, upsizing
to whelk shells as their soft bodies grow up to 15mm (½in) long.
Look out for the common starfish near mussels, one of their favourite foods (which they eat whole), or washed up on the beach after a storm.
Image credits: Naturepl.com, Alamy, FLPA