Killer Dolphins

Vacationers thought the dolphins were fishing for salmon, until they realized a small porpoise was being deliberately targeted and rammed. (News source.)

"Film taken of gangs of dolphins repeatedly ramming baby porpoises, tossing them in the air and pursuing them to the death has solved a long-term mystery of what causes the death of so many of these harmless mammals - but has left animal experts baffled as to the motive.
"Another mystery is that the animal 'murders' have only been reported in two parts of the world - along Scotland's East Coast and in America off the beaches of Virginia, where even more alarmingly, the victims were scores of the dolphins' own young."