It returns to this spot at low tide and clamps firmly to the rock, providing itself with protection from wave action and water loss as well as making it difficult for capture by predators. Some species of limpets do not move far from their home scars and cultivate and protect a private garden of seaweeds around them. By nibbling only the tips of the seaweeds, like cutting a lawn, they maintain a constant supply of food. On the south and west coasts, it forms a dense band at the low tide level. Sewage in river water can carry cholera which is then taken up by shellfish and, when this is eaten by people, the latter can become infected.
Many rocky shores are subject to indiscriminate collecting of bait, shells and rock pool life.
Walk from the high water mark on a rock platform down the shore, noting how the animals and seaweeds occur in particular zones. Do not buy sea shore curios unless you are sure they are legally collected and are not a threatened species. Do not remove sea shore life unnecessarily or without a licence if one is required. G. and M. Branch. Share-Net, P O Box 394, Howick, 3290.