A winter visitor, the well-travelled Bewick's swan is the smallest of our swans. It has more black on its yellow-and-black bill than the whooper swan. Look out for it around Eastern England…

The yellow slug lives up to its name - its yellow body is mottled with grey patches. Often found in gardens and damp places in houses, it can be considered a pest, but is an important nutrient…

The all-black rook is a sociable bird, so can be spotted in flocks or nesting colonies, known as 'rookeries'. Unlike the similar carrion crow, it has a grey bill and 'baggy trouser…

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…

The whooper swan is a very rare breeding bird in the UK, but has much larger populations that spend winter here after a long journey from Iceland. It has more yellow on its yellow-and-black bill…

The notch-horned cleg-fly isa horse fly dark grey in colour, with grey-brown mottled wings and intricately striped, iridescent eyes. There are 30 species of horse-fly in the UK; this is one of the…

This broad, brown bug can often be seen sitting on dock leaves.

Barnacles are so common on our rocky shores that you've probably never really noticed them. They're the little grey bumps covering the rocks that hurt your feet when you're…