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The bird which holds the world’s record for long-dis tance flying is the arctic tern, which you see in the picture. It builds its nest within seven and one-half degrees of the north pole, remaining but a brief period in the “land of the midnight sun,’’ when it flies away to the icebergs of the antarctic continent, a distance of 11,000 miles. Although thousands of these birds make this round trip every year, no one has yet been able to map the route by which they travel. For nearly half the year they are in flight.
保持著長距離飛行世界紀錄的鳥是北極燕鷗，如圖所示。北極燕鷗在北極7.5度的范圍內筑巢，只在“午夜太陽之地”停留一小段時間，然后飛向11000英里外的南極大陸的冰山。盡管每年有成千上萬的這種鳥往返于此，但還沒有人能夠繪制出它們旅行的路線。在將近半年的時間里，它們一直在飛行。
Still, some birds go but a short distance from their northern homes. Such birds as the grouse, quail, cardinal, and Carolina wren do not migrate. The bob-white remains throughout his life close to his first home. Meadow-larks migrate but a very short distance. The pine-warbler and the black-headed grosbeak do not venture in winter south of the country in which they rear their young. The robin does not go far away.
盡管如此，一些鳥離開它們北方的家只有很短的距離。松雞、鵪鶉、紅雀和鷦鷯等鳥類不遷徙。波波白一生都住在他的第一個家附近。草地云雀遷徙的距離很短。松柏鶯和黑頭石首鳥在冬天不會冒險到它們哺育幼鳥的南方去。知更鳥不飛太遠。
