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Old 02-08-2008, 02:37 PM   #2 (permalink)
Martian
Young Crumudgeon
 
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Location: Canada
I'm not an ornithologist, but the explanation I've always heard is that it's a survival mechanism. A single starling is easy pickings for predators, but by forming these huge groups they create a situation where a predator is overwhelmed by the sheer numbers and has a hard time picking out one individual. So safety in numbers and all that.
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