Bottlenose dolphins in British waters are the biggest of their kind – they need to be able to cope with our chilly waters! They are very sociable and will happily swim alongside boats, providing…

You are most likely to spot the cat flea if you have pets. It will feed on cats, dogs and people, although it can't live on us. It is a pest and needs to be controlled in the house for the…

This moth first arrived in the UK in 2007 and has rapidly spread throughout England.

Look out for the feathery leaves of Spiked water-milfoil just below the surface of streams, ditches, lakes and ponds; its red flowers emerge from the water in summer. It provides shelter for a…

The thick topshell is a common sight on rocky shores in Wales and South West England.

Egyptian geese were introduced to Britain from Africa. They are now widespread in southern England.

This pretty, speckled moth is now a rare sight, found only in a few parts of southern England.

The willow tit lives in wet woodland and willow carr in England, Wales and southern Scotland. It is very similar to the marsh tit, but has a distinctive pale panel on its wings.

As the name suggests, this beautiful brown butterfly is most common in Scotland, though it can also be seen in northern England.

With their beautiful striped tentacles, it's easy to see where dahlia anemones got their floral name from. Look out for them next time you're rockpooling!