The sweet chestnut is famous for its shiny brown fruits, or 'chestnuts', that are wrapped in a spiky, green casing and make a tasty winter treat. Look for this tree in woodlands in South…

The fearsome common backswimmer hunts insects, tadpoles and fish. It uses its oar-like legs to swim upside-down under the water's surface where unsuspecting prey can be found.

Also known as 'Goldmoss' due to its dense, low-growing nature and yellow flowers, Biting stonecrop can be seen on well-drained ground like sand dunes, shingle, grasslands, walls and…

Red valerian was introduced in the 1600s from Europe, but is now naturalised in the UK. Its pinky-red flowers grow from old walls, roadside verges, railway cuttings and cliffs, and provide nectar…

As its name suggests, the zebra spider has the familiar black-and-white stripes of a zebra, making it very distinctive. It can be found stalking its prey on rocks, trees and walls, particularly in…

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…

Forming mats of straight, bright green stems, Common spike-rush does, indeed, look like lots of tightly clustered 'spikes' near the water's edge of our wetland habitats.

Caddisflies are a large order of insects that can be found in all kinds of wetlands. The larvae are known for making cases to pupate in, gathering stones, sand and leaves, and wrapping them with…

As the name suggests, the Common medium stonefly is found in gravelly upland rivers and streams, often on bankside stones and plants. There are 34 species of Stonefly in the UK, which are hard to…