This large shrike visits the UK in small numbers each year, passing through on migration or spending the winter here.

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.

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 small white is a common garden visitor. It is smaller than the similar large white, and has less black on its wingtips.

This large, fluffy-looking moth is on the wing in July and August, but you might spot a caterpillar at almost any time of year.

Saw-wort gets its common name from the serrated, saw-like edges to its leaves. It is a plant of unimproved hay meadows and woodland edges, its purple, thistle-like flowers appearing over summer.…

In April and May, our ancient woodlands are awash with the much-loved, nodding heads of the bluebell. Millions of bulbs can exist in just one wood, giving rise to the 'blue carpets' that…

The gatekeeper is on the wing in summer on grasslands, in woodlands and along hedgerows. Look out for the large, distinctive eyespot with two 'pupils' on each forewing.

The waxwing is a colourful winter visitor. It can often be spotted in large flocks in berry-laden bushes in towns, car parks and gardens.

In April and May, our ancient woodlands are awash with the white, starry flowers and smell of wild garlic. Millions of bulbs can exist in just one wood, giving rise to dazzling 'white carpets…

This large brittlestar can be found in rockpools around much of the UK, but be gentle - its arms are very brittle and will break off if disturbed.