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Simply it can defined as the collective behavior of decentralized self organized systems.
The Ant search is ofter highlighted as an example of Swarm Intelligence.The other organisms came under SI are school of Fishes, migrating birds etc.
Swarm Robotics is an emerging area where swarm principles are applied to robots.Read more about SI fro these links
image courtesy :
http://www.newscientist.com/blog/technology/uploaded_images/swarm_escape-708935.jpg
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