A bushy brown seaweed that appears bright blue underwater.

One of the longest seaweeds native to the UK, thongweed helps create a beautiful underwater forest to rival that of any on the land!

The branching, finger-like projections of this fungus give it the appearance of an underwater coral. Its striking colour and form make it easy to spot, but it is scarce in the UK.

The chocolate-brown, plump dipper can often be seen bobbing up and down on a stone in a fast-flowing river. It feeds on underwater insects by walking straight into, and under, the water.

The little grebe is a fantastic diver, but to help it swim underwater, its feet are placed towards the back of its body, making it rather clumsy on land. It only really comes ashore to breed.

An underwater predator, the Saucer bug uses its front pincer-like legs to catch its prey. It can be found at the bottom of muddy, weedy ponds; but handle with care - it can inflict a painful bite…

The water stick insect looks just like a mantis. An underwater predator, it uses its front legs to catch its prey. Its tail acts as a kind of 'snorkel', so it can breathe in the water.…

It's easy to see where the jewel anemone got its name - the tiny colourful blobs that tip its tentacles look like jewels! Forming dense, colourful carpets on rocky overhangs, jewel anemones…