The river lamprey is a primitive, jawless fish, with a round, sucker-mouth which it uses to attach to other fish to feed from them. Adults live in the sea and return to freshwater to spawn.

The easiest way to find out if the nocturnal and well-camouflaged nightjar is about is to listen out for its distinctive 'churring' call at dusk. A summer visitor, it is most numerous in…

Famously predatory, the long, slender pike will lurk among the vegetation of a river or lake, bursting out with ferocious speed to catch its prey. Look out for it across the UK.

Found around our coasts during the breeding season, the large Sandwich tern can be spotted diving into the sea for fish such as sandeels. It nests in colonies on sand and shingle beaches, and…

The black-and-white barnacle goose flies here for the 'warmer' winter from Greenland and Svalbard. This epic journey was once a mystery to people, who thought it hatched from the goose…

The eel is famous for both its slippery nature and its mammoth migration from its freshwater home to the Sargasso Sea where it breeds. It has suffered dramatic declines and is a protected species…