Anchoring themselves to blades of grass or fingers of coral with their tails, seahorses spend their time feeding on zooplankton.
海马常用尾巴将自己固定在水草或珊瑚枝上，以过往的浮游动物为食。
2
But daily vertical movements by zooplankton in the ocean—upward by night to seek food, downward by day to escape predators—can also be considered migration.
但是海洋中浮游动物每天的垂直运动——夜里上浮以寻找食物，白天下潜以躲避捕食者——也可以被视作迁徒。
3
Many theories have been formulated to explain the role of grazers such as zooplankton in controlling the excluded grazers from regions of high phytoplankton concentration.