Bài V
Dolphins communicate mainly by means of sounds. These sounds include whistles, bit also so-called pulsed sounds; which are often described as squawks, barks, rasps, etc. But they also use breaching (jumping and falling back into the water with a loud squash) and pectoral fin (or flipper) and tail (or fluke) slaps (hitting the flipper or fluke on the water surface). Body posturing and jaw popping also have a role in communication. This list is not exhaustive.
As for language, we do not know if they have one. Several studies have demonstrated that dolphins can understand a structured language like ours. This same has been demonstrated for a number of other animal species as well (gorilla, bonobo, California sea lion, and parrot). Some studies also indicate that dolphin vocalizations are complex enough to support some forms of language. However, to date it has not been demonstrated yet they indeed use a language for communication among themselves.