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 newly arrived wren wants a sheltered place tobuild a nest, away from the wind and rain. He wants it close to food, andattractive to potential mates. He also wants to convince competitors for thatspace to keep their distance.
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