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对家鸽何以具有给人以深刻印象的辨向能力的根源所进行的探究,已经发生了最奇异的变化。过去四年里在西德思威森(Seewiesen)的麦克斯·普兰克(Max Planck)生态学院所进行的工作似乎证实了一个十二年前第一次提出来的让人听起来觉得不大可能的理论——那就是:鸟类凭借嗅觉可以找到它们的归途。没有人能够知道鸟类究竟嗅觉到了什么、以及它们是怎样利用嗅觉来辨识飞行方向的。负责这项研究工作的汉斯·华尔拉夫(HansWallraff)所能断言的也仅仅是:失去嗅觉的鸽子
The most singular changes have taken place in the inquiry about why pigeons have an impressing source of discerning power. The work done over the past four years at the Max Planck Institute of Ecology in Seewiesen seems to confirm the first few years ago that did not sound like much The possible theory - that is: birds can find their way back through their sense of smell. No one knows exactly what the birds smell and how they use their sense of smell to identify the direction of flight. Hans Wallaff, who was in charge of the research, could only assert that the lost pigeon