Found in ponds and marshes, the fragile look of the common water-measurer belies its fierce nature. A predator of small insects, it uses the vibrations of the water's surface to locate its…

Brittle stars, sea urchins and other starfish will want to stay out of the way of this speedy carnivorous starfish!

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 Leyland cypress, or 'Leylandii', is a notorious tree that has been widely planted for its fast-growing nature. It easily can get out of control, shading gardens at the expense of…

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…

A lovely pale cream colour to begin with these stout mushrooms begin to turn a buff colour and the cap surface will crack as they age.

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…

This clown-like fish is a favourite amongst divers and snorkellers. They are inquisitive little souls and will investigate divers near their hidey-hole homes.

Look out for the bright red eyes of this speedy crab in rockpools - but be careful, they're notoriously feisty and will give a painful nip!