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High-tech Crane Migration
As winter sets in, millions of birds leave their nests in the northern hemisphere and head towards warmer lands in the south. During spring, they once again wing their way back to their original nesting grounds. This yearly ritual is known as migration. While some birds are great travellers, flying from one country to another; others merely flap down from the high mountains to sheltered valleys for the winter. The Arctic tern (of North America) is the hardiest traveller of all....
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