Escaped or intentionally freed from fur farms in the 1960s, the American mink is now well established in the UK. Its carnivorous nature is a threat to our native water vole and seabird populations…

The eel is famous for both its slippery nature and its mammoth migration from its freshwater home to the Sargasso Sea where it breeds. It has suffered dramatic declines and is a protected species…

The Oak bush-cricket is arboreal and can be found in mature trees in woods, hedges, parks and gardens in summer. Males don't have a 'song' as such, but drum on leaves with their…

Our largest shieldbug, the red-and-green hawthorn shieldbug can be seen in gardens, parks and woodlands, feeding on hawthorn, rowan and whitebeam. The adults hibernate over winter.

Weasels may look adorable, but they make light work of eating voles, mice and birds! They are related to otters and stoats, which is obvious thanks to their long slender bodies and short legs.

The ptarmigan is a master of disguise - matching its Highland surroundings perfectly by turning snow-white in winter and rock-grey in summer. It is confined to the mountains of Scotland, so is…

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.

A delicate wader, Red-necked phalaropes are as comfortable swimming as they are on land. Unusually for birds, the females are more brightly coloured than the males.

Our largest bat, the noctule roosts in trees and can be seen flying over the canopy in search of insect-prey, such as cockchafers. Like other bats, it hibernates over winter.