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.

This small duck is an uncommon winter visitor to the UK, where they're usually found on lakes, reservoirs and gravel pits.

Although introduced by humans, the fallow deer has been here so long that it is considered naturalised. Look out for groups of white-spotted deer in woodland glades.

The spiky, silvery leaves of Sea-holly give this plants its common name. Look for its beautiful, thistle-like, blue blooms on coastlines and sand dunes in summer.

Swifts spend most of their lives flying – even sleeping, eating and drinking – only ever landing to nest. They like to nest in older buildings in small holes in roof spaces.

The wigeon is a colourful duck that can often be spotted wheeling round our winter skies in large flocks. A dabbling duck, it surface-feeds on plants and seeds in shallow waters.

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…

Often seen carpeting the floor of ancient woodlands, Dog's mercury can quickly colonise, its fresh green leaves shading out rarer plants. It is also very poisonous.

The Leyland cypress, or 'Leylandii', is a notorious tree that has been widely planted for its fast-growing nature. It easily can get out of control, shading gardens at the expense of…