Look for the wood warbler singing from the canopy of oak woodlands in the north and west of the UK. Green above, it has a distinctive, bright yellow throat and eyestripe.

This hefty diving bird is a winter visitor to the UK, where it can be seen around the coast or occasionally on large inland lakes.

The blackbird of the mountains, ring ouzels can be found breeding on upland moors and rocky crags in summer.

The Arctic tern is famed for its aggression towards any that would disturb its nest - it will dive-bomb intruders with its sharp beak. Large, noisy colonies can be found on the Farne Islands and…

This common fungus puffs out clouds of spores when it's mature.

Sea potatoes may have a funny name, but they are perfectly adapted for life in the sand. They are a type of sea urchin that live in a burrow in the sand, feeding on dead animals and plants using…

Found along the coast all year-round, the dunlin is a small sandpiper that breeds and winters in the UK. It can be seen in its upland breeding grounds in summer, when it turns brick-red above and…

The mountain hare lives in the Scottish Highlands and the north of England. They are renowned for turning white in winter to match their upland surroundings.

A summer visitor, the wheatear is a handsome chat, with black cheeks, white eyestripes, a blue back and a pale orange chest. Look for it on upland heaths and moors.