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 Atlantic salmon spends most of its life at sea, but makes an epic journey back to the river or stream in which it hatched to spawn. Look out for it in freshwater rivers in the north and west…

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 common scoter has suffered large declines in the UK, threatening its survival here. Look out for this duck feeding at sea in winter when its numbers are bolstered by migrating birds.

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…

The white admiral is a striking black-and-white butterfly with a delicate flight that includes long glides. It prefers shady woodlands where it feeds on bramble.

A fierce pirate of the sea, the Arctic skua is renowned for stealing fish from other seabirds and dive-bombing anyone that comes near its nests. It breeds in the far north of Scotland and on the…

The bluefin tuna is a highly migratory fish which roams the oceans. This species will cross oceans, travelling between the Mediterranean Sea and the Gulf of Mexico. They are speedy swimmers,…