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Nature's Invaders24:42
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photoWhen we think of nature, we don't usually think of Hawaiian forests trampled by feral pigs or dog food-eating brown tree snakes. But in a world where no corner is spared, nature isn't as pristine as we would like to think.

In a new book, senior editor for Discover Magazine Alan Burdick says that nature's intruders are everywhere — often in the form of species plucked from one ecosystem and dropped into another, sometimes with disastrous results.

Hear a conversation with Burdick about the relentless march of invading species and their impact on ecosystems.

Guests:

Alan Burdick, senior editor for Discover Magazine and author of "Out of Eden: An Odyssey of Ecological Invasion."

This program aired on June 27, 2005.

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