For sheer distance, the arctic tern probably holds the record;

仅就距离而言，恐怕当首推北极燕鸥了；

The understanding is that the Arctic Tern is a migratory bird which is mainly found at the North Pole and surrounding regions.

据了解，北极燕鸥是候鸟，主要分布于北极及北极附近地区。

But one species, the arctic tern, flies to northern Europe all the way from the Antarctic. No animal on earth migrates this far.

而有一种鸟类，北极燕鸥，却从遥远的南极洲一路飞抵北欧，地球上没有任何动物能迁徙这么远。

The Arctic tern completes a round trip of 32, 000km; swallows, which have already deserted us, will now be sunning themselves in the southern tip of Africa.

北极燕鸥一次往返的距离达3.2万公里，早已离开了我们的燕子现在正在非洲南端享受着太阳的温暖。