Dolphins. They just rescued a baby dolphin here yesterday. It was tangled in discarded fishing line. The team from Sea World and a dozen volunteers surrounded and held the baby while they cut her loose from her tangle. The mother never left her side and was very tolerant of the people. When the baby was freed they did not leave in a hurry, but hung around to say a dolphin thank you.
Also . . . sometimes they will knock a fish in the air several times before eating it. I told my kids when they were small, "Only Dolphins are allowed to play with their food."