Despite being all powerful, sharks are still invulnerable.They do have several formidable enemies other than man. The unfortunate shark that consumes a porcupine fish will suffer dire consequences. This unique fish will inflate itself inside the shark’s jaws, preventing the flow of water through the shark’s gills. This defense mechanism will asphyxiate the larger creature. The great squid and salt-water crocodile are both fierce shark hunters. The killer whale has been seen to swallow a shark whole.
While dolphins and sharks have been known to coexist peacefully, a dolphin can efficiently dispose of a shark. One technique of the dolphin is to swim full-speed towards the abdomen of the shark, smacking into this tender area and causing the shark’s delicate intestines to hemorrhage. Dolphins also bump into the gills of the shark, which destroys the shark’s ability to breathe. In one case, there was an aquarium where a shark and several dolphins had been living together without difficulty for some time when the dolphins, for unknown reasons, threw the shark out 20 feet away onto the floor.
bibliography:http://www.sharkattacks.com/enemies.htm
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