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.

The green sandpiper is a very rare breeding bird in the UK, and is mainly seen on migration in autumn. Look out for it feeding around marshes, flooded gravel pits and rivers. It even likes sewage…

A pretty and distinctive little waterbird, the mandarin duck was introduced from the Far East as its name suggests. Oddly for a duck, it nests in trees, sometimes high above the water.

The defensive mechanism of the pill woodlouse is very recognisable - it curls itself into a tight ball, only showing its plated armour to its attacker. It is an important recycler of nutrients,…

When spotting the pintail in winter, look out for the fabulous, long tail feathers that characterise it. This dabbling duck feeds at the water's surface, rather than diving for food.

The sinuous otter is an excellent swimmer and can be seen hunting in wetlands, rivers and along the coast - try the west coast of Scotland, West Wales, the West Country or East Anglia for the best…

This dainty seaduck is a winter visitor to our coasts, particularly in northern and eastern Scotland.

The pretty small tortoiseshell is a familiar garden visitor that can be seen feeding on flowers all year-round during warm spells. Overwintering adults may find resting spots in sheds, garages or…

Found in compost heaps and under stones in gardens, the white-legged snake millipede is a common minibeast. Despite its name, it has about 100 legs. It is an important recycler of nutrients,…