kashmaster said:Killer whales have been known to kill great White sharks. Proving they are the ultimate predator in water
Adding on to this really fun fact, the Killer Whales hunt the sharks by biting their tails and... flipping them over. Yep. If you flip over a shark onto its back, its brain becomes scrambled and shuts down.
EDIT: Ah, my bad! THE WHALES USE KARATE FIRST.
Source: http://www.dailymail.co.uk/sciencetech/article-1231454/Killer-whales-Death-karate-chop-deadly-tactic-used-orcas-sharks.html