Our smallest breeding seabird, the storm petrel is barely larger than a house martin! They mostly nest among rocks or in burrows on small offshore islands.

The disc-shaped leaves and straw-coloured flower spikes of Navelwort help to identify this plant. As does its habitat - look for it growing from crevices in rocks, walls and stony areas.

Parsley fern lives up to its name - the pale green fronds form in clusters among rocks and look just like parsley. Look out for it in upland areas, particularly in Wales and Cumbria.

As its name suggests, the zebra spider has the familiar black-and-white stripes of a zebra, making it very distinctive. It can be found stalking its prey on rocks, trees and walls, particularly in…

It's easy to see where this small starfish got its name, it really does look like a little star-shaped cushion. Keep an eye out under rocks next time you're rockpooling for this little…