The porpoise is flipped into the air as the dolphin goes on the attack at Newlyn Harbour. A bottlenose dolphin has been pictured flipping a porpoise into the air in a deadly attack. The rarely seen event was witnessed by gig rowers in Newlyn Harbour in Cornwall. Dolphin attacks on porpoises accounted for about one death a year on average, said Cornwall Wildlife Trust (CWT). It is unclear why dolphins attack porpoises but it could be an aggressive response to feeding competition or even “misdirected sexual aggression“. No-one is quite sure why dolphins attack porpoises but it could be an aggressive response to feeding competition. CWT said: “We are unsure of why this happens and it is certainly not predation. “Many theories have been put forward, including misdirected infanticide (bottlenoses will kill calves), misdirected sexual aggression or play behaviour and an aggressive response to feed competition are just some.” Marine Strandings Network said it found the carcass of the porpoise, which had “multiple severe injuries as a result of the attack”. “We do have a number of dead porpoise, and more unusually common dolphin, reported to us with injuries resulting from bottlenose dolphin aggression.”

porpoise: n.鼠海豚