If a grouper chases a fish into a crevice in the coral, it will sometimes go to where it knows a moray eel is sleeping and it will signal to the moray, "Follow me," and the moray will understand that signal.
Se un mero persegue un peixe ata unha greta no coral, irá onde sabe que hai  unha morea durmindo e diralle á morea "sígueme", e a morea entenderá ese sinal.