Hi Newbie here.
Sorry for bringing life back into this topic a year and a half after it was locked, but i felt i had to post about it that a russian guy called Paulwhale would defend that no other animal can kill a Sperm Whale as its pure size was too much for anything to kill it.He kept going on how Sperm Whales could sink boats with its huge head and teeth and a swish from its tail can cause lots of damage also.He ruled out attacks from giant squids and great white sharks would cause mere pin pricks on a huge whale of 150 tons maybe this is true but he made the mistake that Orca's wouldn't stand a chance either! Not true....An Orca is part of the Dolphin family which makes it rather a smart animal indeed you mix that with speed and agility along with a killer instinct you get a highly skilled killing machine.We already know that Dolphins are capable of killing sharks a lot bigger than themselves with speed and also out smart a large shark. Orca's are pretty much the same as Dolphins but on a much larger scale and they also have more ferocity in attacks.Now with a Killer Whale being smart and all that its not going to be stupid enough to ram a Sperm Whale head on or hang around the Sperm Whales tail too much so its going to attack from above or below where the Sperm Whale is most vulnerable. Although Sperm Whales are fairly immune from predators particularly large Bulls, Orca's are perhaps its only one predator and they have even also thought to have preyed upon the fearsome Megalodons and as the link below shows don't f*** with Orca's.
http://findarticles.com/p/articles/mi_m113...i_53378967/pg_3