1.Another marathon migrator, the Arctic tern, has long been credited with the longest migration for its annual round-trip flight between the Arctic and Antarctic — an estimated 40,000 km in total.
另一种马拉松式的迁徙者——北极燕鸥,因其每年在北极和南极之间的往返
行而长期被认为是
长的迁徙——估计总共有4万公里。