The common dolphin is up to 7 feet long, and the bottlenose, up to 12 feet. Many dolphins have a pronounced beak and all have a central dorsal fin and sharp teeth for feeding, mainly on squid and fish. Growing evidence shows that the big animals, up to 12 feet long, are killing fellow mammals in droves, wielding their beaks as clubs and slashing away with rows of sharp teeth. Dolphins have been found to bludgeon porpoises to death by the hundreds. Unlike most animal killers, which eat their prey, dolphins seem to have murderous urges unrelated to the need for food. Marine mammals increase the overall health of the oceanic ecosystem by helping to counteract ocean stratification, thus making it easier for phytoplankton to grow. By diving into deep waters to feed, then rising to the surface of the water to breathe, marine mammals create a “biological pump” which mixes the ocean’s layers. This natural movement of marine mammals causes the nutrients in the deep waters to circulate up to the sunlit surface, aiding phytoplankton growth and supporting the food web. Since the WoRMS project began in 2008, it has also listed about 1,000 new types of fish – including a
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