An attractive, green-and-yellow bird, the siskin regularly visits birdtables and feeders in gardens. Look for the bright yellow barring on its black wings, and the black crown of the males.

The grass snake is our longest snake, but don't worry if you find one in the compost heap - it's harmless! Look out for this green and yellow beauty in grasslands and wetlands, too.

Considered a gardener’s best friend, hedgehogs will happily hoover up insects roaming in vegetable beds. Famously covered in spines, hedgehogs like to eat all sorts of bugs and crunchy beetles.…

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.

Common couch is a tall, tuft-forming grass of roadside verges, waste ground and arable land. It is very tough and can shade out more delicate plants. Look for flat, blade-like leaves and thin…

A non-native species originating from Asia, the harlequin ladybird is prevalent in towns and gardens.

Parsley fern lives up to its name - the pale green fronds form in clusters among rocks and look just like parsley. Look out for it in upland areas, particularly in Wales and Cumbria.

One of our largest ducks, the shelduck is a handsome creature with a dark green head, red bill and chestnut-brown band across its white body. Look out for it around most of our coastline,…