Why pufferfish puff

[youtube]http://www.youtube.com/watch?v=OkXhC7yzISI&feature=player_embedded[/youtube]

Okay, so I admit this is a river story but I can only imagine similar things go on in the sea. And it just goes to show how blowing up like a beach ball is a really effective way of seeing off predators.

HT to Practical Fishkeeping for the link.

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