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。

It happens from the smallest animals to some of the largest and the most abundant, in terms of biomass, migrators are typically small fish like bristlemouths and lantern fish that are following the vertical migrations of the zooplankton.

从小的动物到大和丰富的，就生物量而言，迁徙者通常是小鱼，如刚毛鱼和灯鱼，它们跟随浮游动物的垂直迁徙。