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About the only animals that I know that kill just for the joy of it is a house cat, and a few humans.
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Killer Whales toy and play with seals once they've caught them out in the open by tossing them out of the water with their tails. This is done for sport (or could be debated as "pleasure") and not for survival. There are many other instances of this in the animal kingdom.
http://www.youtube.com/watch?v=O0qMT2YBIcg