There is a particular attraction about the transition zone between the waters edge and the banks that hem it in. These zones are sometimes profitable, often interesting and frequently dangerous. In the natural word boundaries between habitats, areas where one ecosystem shades into another (‘ecotones’ as they are called) are often places that have a bit of the character of both. They may have more sun for these living out in the open, a little less for those living in the shade. They may be shallower for those coming from the deep, or deeper for those coming from the shore. They also collect food.