从北极到南极的壮丽迁徙之旅
Every year, a small seabird undertakes a journey so vast it seems like a myth. The Arctic tern, a graceful white-and-grey flier, migrates from its northern breeding grounds to the Antarctic seas and back again. This round trip can span over 90,000 kilometers, making it the longest annual migration of any animal on Earth. In its pursuit of endless summer, the tern tags along with the sun, rarely knowing darkness at all.
The birds set off from Arctic coasts, from Alaska to Scandinavia, as the northern summer fades. They do not simply head south in a straight line: scientists have tracked them along meandering ocean routes that often take them down the west coasts of Africa and the Americas. One tagged bird flew almost 96,000 kilometers in a year, zigzagging across the Atlantic as if reading wind and current maps invisible to us. Such feats demand not just endurance but an extraordinary internal compass that still puzzles researchers.
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