The otherworldly mollusks are among the most invasive alien species in the western United States and have recently spread into waterways in the Sierra and eight of the Bay Area’s nine counties. It is an invasion, no less, of voracious armored critters, and nobody can figure out how to stop them.

Source: Destructive snails are invading Bay Area waters. And no one knows what to do – SFChronicle.com

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