An arctic tern, on its 20,000 km flight from the extreme south of South America to the Arctic circle, will take no notice of a nice smelly herring offered from a bird-watcher's boat along the way.
An arctic tern on its way from Tierra del Fuego to Alaska, for instance, will ignore a nice smelly herring offered from a bird-watcher's boat in Monterey Bay.
举例来说，从火地岛前往阿拉斯加的北极燕鸥会无视蒙特利湾观鸟船送出的美味鲱鱼。
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Because the Arctic is covered with ice and water, he would sometimes have to sit on his sledges and use them like a boat!