Spadefishes often follow divers.They used to swim near a bigger herbivores than them.Many time I have seen them swimming near a turtle.And I heard that some diver had watched they had eaten a dung of turtle.Although divers will not take a shit in water.(Ogasawara-Isls/Tokyo、Japan)
ツバメウオは、ダイバーのあとをよく追いかけてくる。自分たちより大きな草食生物のそばを泳ぐ習性があるようだ。カメの近くを泳いでいる姿をよく見るし、カメのふんを食べるのを見たことがある人もいる。ヒトは、水中でふんをしないのだけれど。