Untitled(_Procellaria Pelagica_)This characteristic bird of the open sea does not come to land at allexcept to nest. It is the smallest web-footed bird, about four incheslong. The legs are long and often touch the water as the bird flies. Thestorm petrel is at home in the Atlantic, and often nests on islands offthe west coast of Britain.]IV. THE FRESH WATERSOf the whole earth's surface the freshwaters form a very small fraction,about a hundredth, but they make up for their smallness by theirvariety. We think of deep lake and shallow pond, of the great river andthe purling brook, of lagoon and swamp, and more besides. There is astriking resemblance in the animal population of widely separatedfreshwater basins: and this is partly because birds carry many smallcreatures on their muddy feet from one water-shed to another; partlybecause some of the freshwater animals are descended from types whichmake their way from the sea and the seashore through estuaries and
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