The Common walnut tree produces a large, brown nut that is familiar to so many of us. It is an introduced species in the UK, and can be seen in towns, gardens and parks.

Despite its name, the common gull is not as common as some of our other gulls. It can be spotted breeding at the coast, but is also partial to sports fields, landfill sites and housing estates in…

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

The common rosefinch is a rare visitor to the UK, usually passing through in autumn.

As the name suggests, the Common medium stonefly is found in gravelly upland rivers and streams, often on bankside stones and plants. There are 34 species of Stonefly in the UK, which are hard to…

The fearsome common backswimmer hunts insects, tadpoles and fish. It uses its oar-like legs to swim upside-down under the water's surface where unsuspecting prey can be found.

The Common osier is a small willow tree that is found in fens and ditches, and on riverbanks. It has been widely cultivated and coppiced for its twigs, which are used in traditional basket-making…