This large round urchin is sometimes found in rockpools, recognisable by its pink spiky shell (known as a test).

Despite its dazzling colouration, this fabulous nudibranch can be easily missed, due to its small size!

Despite its name, the great spider crab is actually smaller than the more common European spider crab.

Largely confined to the north of the UK, the rare pine marten is mostly nocturnal and very hard to spot. Reintroductions are helping it make a comeback.

As its name suggests, the house martin can be spotted nesting in the eaves of houses in our towns and villages. Its intricate mud nests take days to build and are often returned to and used in…