Questão 620100

It is perhaps easy enough to identify good ecological reasons why animals should migrate, and even to appreciate that the timing of migrations might be determined by environmental cues such as changing day-length or temperature. The real mystery that has baffled scientists and non-scientists alike over the centuries has been how the migrants know which way to go. To arrive at a pinpoint in the middle of an uncharted ocean is no mean feat for human navigators, even with modern satellite navigation systems to hand. That ‘mere’ animals can achieve the same without the advantage of even the crudest sextant or compass seems little short of miraculous.

Peter Buckley and Luke Prodromou. On the move — An advanced English course. Oxford University Press, p. 214 (with adaptations).

From the text above, it can be inferred that

scientists are still trying to solve the mystery of the animals’ migration.