Dolphins ' piggy back ' on humpback whales.

Many species interact with their wild predators, but this is not to say that the meeting ends in tragedy. Recent meetings between humpback whales and dolphins showed the playful and fun side of these interactions.
In two different locations in Hawaii, scientists observed dolphins "riding" on the heads of whales. Whales raised dolphins up and out of the water, and then they slipped back down.
The two species seem to cooperate in the activity, and do not show signs of aggression or suffering. Whales and dolphins of Hawaiian waters interact often, but a fun social activity like this is extremely rare among the species.