The yellow meadow ant is known for creating anthills in grassland habitats. It has a close relationship with the Chalkhill blue butterfly - protecting the larvae in return for a sugary substance…

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.