磁性罗盘上的指针指向北方磁极。
The needle of a magnetic compass points to the magnetic North Pole.
“它们还有磁性罗盘使它们能够航行成千上万里，即使在晚上。”罗布森说。
"They also have a magnetic compass that enables them to navigate thousands of kilometres, even at night," says Robson.
鸟的眼睛中的细胞可能会是鸟嘴里细胞价值的两倍，至少当谈到候鸟的磁性罗盘来说是这样。
A cell in the eye may be worth two in the beak, at least when it comes to a migratory bird's magnetic compass.
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