07/05/2010 05:12 am ET Updated May 25, 2011

Gulf Oil Spill: The Effect On Animals Runs Deep

Breton Island, with its hundreds of nesting birds, has been protected by orange booms, as have many other areas of delicate estuaries and wetlands.

But biologists are increasingly alarmed for wildlife offshore, where the damage from a spill can be invisible but still deadly.

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