Often seen carpeting the floor of ancient woodlands, Dog's mercury can quickly colonise, its fresh green leaves shading out rarer plants. It is also very poisonous.

The all-black carrion crow does not nest in colonies like the similar rook. It can be seen almost everywhere.

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.

The ringed plover is a small wader that nests around the coast, flooded gravel pits and reservoirs. It is similar to the little ringed plover, but is a little larger, has an orange bill and legs,…

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.

A sprawling, spiny evergreen, Common juniper is famous for its traditional role in gin-making. Once common on downland, moorland and coastal heathland, it is now much rarer due to habitat loss.…

The cormorant is an excellent fisher. It is most easily spotted when it is perched, stretching its wings out in the sun to dry after a dive. The UK holds internationally important wintering…

Despite appearances, this weird and wonderful creature is not a jellyfish! They're sometimes found washed up on our shores after westerly winds. Look but don't touch - they give a very…