The tiny firecrest vies with the goldcrest for the title of the UK's smallest bird. Once just a visitor, the firecrest can now be found breeding in woodlands in the south of England.

The song of the Roesel's bush-cricket is very characteristic: long, monotonous and mechanical. It can be heard in rough grassland, scrub and damp meadows in the south of the UK, but it is…

The last thing you’d expect this extraordinary creature to be is a fish!

Their long narrow shells are a common sight on our shores, especially after storms, but the animals themselves live buried in the sand.

This bog-loving butterfly is mostly found in the north of the UK, where it takes to the wing in summer.

The sinuous otter is an excellent swimmer and can be seen hunting in wetlands, rivers and along the coast - try the west coast of Scotland, West Wales, the West Country or East Anglia for the best…

The rare heath fritillary was on the brink of extinction in the 1970s, but conservation action turned its fortunes around. It is still confined to a small number of sites in the south of England,…

The thresher shark is a migratory species and passes through UK waters in the summer months. If you’re lucky, you might see this magnificent shark jump high out of the water in to the air.