Limpets and their amazing feet
Three British species of limpet are difficult to tell apart just from their shells. If you were to sneak up and carefully dislodge one from a rock then its foot colour would tell you which species it is:
The common limpet ( Patella vulgata) ( pictured right) has a greenish grey foot. The china limpet ( Patella ulyssiponensis) has an apricotcoloured foot.
The black-footed limpet ( Patella depressa) has a dark grey-black foot.