It builds its nest within seven and one-half degrees of the north pole, 北极燕鸥在北极7.5度的范围内筑巢，

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. 只在“午夜太阳之地”停留一小段时间，然后飞向11000英里外的南极大陆的冰山。

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. 尽管每年有成千上万的这种鸟往返于此，但还没有人能够绘制出它们旅行的路线。

For nearly half the year they are in flight. 在将近半年的时间里，它们一直在飞行。

Still, some birds go but a short distance from their northern homes. 尽管如此，一些鸟离开它们北方的家只有很短的距离。

Such birds as the grouse, quail, cardinal, and Carolina wren do not migrate. 松鸡、鹌鹑、红雀和鹪鹩等鸟类不迁徙。

The bob-white remains throughout his life close to his first home. 波波白一生都住在他的第一个家附近。

Meadow-larks migrate but a very short distance. 草地云雀迁徙的距离很短。

The pine-warbler and the black-headed grosbeak do not venture in winter south of the country in which they rear their young. 松柏莺和黑头石首鸟在冬天不会冒险到它们哺育幼鸟的南方去。

The robin does not go far away. 知更鸟不飞太远。