Other creatures have this problem, too. When songbirds come north in thespring, for example, they engage in ferocious territorial disputes. The songs theysing, so peaceful and beautiful to human ears, are siren calls and cries ofdomination. A brilliantly musical bird is a small warrior proclaiming hissovereignty. Take the wren, for example, a small, feisty, insect-eating songbirdcommon in North America. A
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