Orca (also known as Killer Whales) are known to use complex tactics in order to capture prey.  This video displays a fine example of cooperation and planning to obtain some food...

I feel a bit sorry for the seal, but that is the way of nature.  What I find unique about this tactic is that only one whale benefits from a meal, while the others do the grunt work.  I wonder if they take turns at getting the prize?

Video uploaded by Animal Planet on August 6, 2008.

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