Flash Expansion of Whirligig Beetles

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Uploaded by on Aug 19, 2009

Here are a bunch of whirligig beetles swimming on the surface of the water in a kiddie pool. They show classic grouping behavior to avoid predators, and when disturbed (several times here by me moving my hand) they show what is called a "flash expansion". This helps confuse predators.

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Education

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Standard YouTube License

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  • great example of flash expansion!

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