Two of these vividly coloured caterpillars were feeding together, each slightly different in pattern, from the other. Despite their name, they are not exclusively associated with saltmarshes, which is a good thing, as the nearest saltmarsh is a very, very long way away! Although they are found in saltmarshes, and other marshes, they are also found in farm fields, edges of woodlands, etc. These caterpillars will turn into a beautiful black and white spotted moth.