The nuthatch is a tit-sized, grey and rust-coloured bird that can be easily spotted climbing headfirst down tree trunks in woodlands and parks.

The chocolate-brown, plump dipper can often be seen bobbing up and down on a stone in a fast-flowing river. It feeds on underwater insects by walking straight into, and under, the water.

With a silvery body, and purple, pink and bluish streaks down its flanks, the rainbow trout lives up to its name. Popular with anglers, it is actually an introduced species in the UK.

The Natterer's bat can found across the UK, although it is a scarce species. It prefers to forage low down among trees, often taking prey directly from the foliage.

The wolf spider can be found in a wide range of habitats, including the garden. It hunts down its prey, leaping on it just like a wolf. Spiders are beneficial neighbours, helping to manage garden…

The gadwall is a dabbling duck, feeding at the surface of shallow water by 'upending' - putting its head down and its bottom up! Only a small number of gadwall nest in the UK, but large…

When threatened, the Green tortoise beetle acts just like a tortoise, pulling its feet and antennae in and hunkering down, gripping the leaf it is on as tightly as possible. Look for it on White…

These non-native limpets arrived from America in the 19th century and are now widespread in the UK. They form stacks and have a specially adapted shell which, when flipped upside down, looks like…