Like the humpback whales in this video.
What's the purpose of this behavior? Is it just playing or does it have a different reason?
-
Enjoyment. Cetaceans (whales and dolphins) are highly intelligent. Their calls are highly complex means of communication....and its suspected that dolphins have near-(adult) human levels of intelligence. (By comparison your typical adult dog has a level of intelligence and problem solving ability on par with that of a human toddler). A particularly smart dog perhaps that of a three year old.