Arctic terns found in North America and the Arctic migrate each year as far south as Antarctica and back, a round trip of over 18,000 miles.
Arctic terns found in North America and the Arctic migrate each year as far south as Antarctica and back, a round trip of over 18,000 miles.
人们发现北美洲和北极地区的北极燕鸥每年一直要迁移到南极洲再飞回来，往返形成超过18,000英里。