The sea mouse (Aphrodita aculeata) is a species of marine worm which is found in the waters of the United Kingdom and across Europe. They can grow to around 20cm (8 inches) in length and 5cm (2 inches) across. The body is segmented and covered in fur or hair-like structures (which give the species its name due to its resemblance to a rodent). The colour is a dull brownish to grey, although the fur has an iridescent gold, blue, red or orange sheen. They are predators which feed on small crabs and worms which they find in the seabed. The sea mouse can be found in waters hundred or even thousands of metres deep. They are not typically found on the coastline, although they can occasionally be seen on the lowest of spring tides, or occasionally washed up on beaches after a storm.