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.

Yr wylan gefnddu fwyaf yw’r wylan fwyaf yn y byd! Oherwydd ei maint, ychydig o ysglyfaethwyr sy’n ceisio ymosod arni, ond gall fod yn fyrbryd blasus o dro i dro i eryrod cynffon gwyn, siarcod a…

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

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 UK is home to so many incredible sea slugs, like this elegant nudibranch.

A rare breeder in the UK, this sooty-coloured bird is as at home on an industrial site as it is on a rocky cliff face.