Seashore. Nick Baker

> paper

       > pencil

      1 Using the model paint and paintbrush, mark a few limpets on a rock with a tiny blob of coloured paint.

      2 Draw a map of the rocks and the positions of your colour-coded limpets.

      3 Return the next day. Have they moved? Most of them probably won’t have, but some may well have moved a surprising distance. To find out just how much they do shuffle about, return to the same spot at night on a low tide. Try to find your molluscs then – you’ll be surprised . . .

      Take it further

      * Don’t feel you should limit your marking studies to limpets. You can try similar studies with any hard-shelled creatures, such as winkles and crabs.

      * Use different-coloured paints for limpets on different rocks. With time, will they intermingle?

       Shell collecting

      The seashore is a tough place to live for a soft-bodied creature. There is the continuous pounding of the waves and the constant threat from predators from the sea, land and air. Then, for those creatures that live on the main part of the beach, there is the threat of being left out in the open, exposed to the drying effects of the wind and the sun. Five minutes of summer sun could turn a succulent, soft sea slug into a crisp!

      One easy fix for all of these survival problems is to live in your own portable, environmental protection suit, which is exactly what a sea shell is to a snail!

      Any strand line, anywhere in the world, will probably have some of these beautiful structures, cast up from the ocean, their original molluscan creators long since gone. Be warned, though, shell collecting is very addictive. Once you have started walking a strand line, you will be surprised just how far you have strolled, eyes down searching for the next piece of natural treasure!