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 tiny, brown-and-white sand martin is a common summer visitor to the UK, nesting in colonies on rivers, lakes and flooded gravel pits. It returns to Africa in winter.

This glossy wading bird is a scarce visitor to the UK, though records have become more common in recent decades.

This stunning hermit crab has only returned to our southern shores in recent years. Let us hope it stays for good this time!