Items by Guy Webster

The snail that stands like a dam
Future human-made floods from Glen Canyon Dam, designed to help restore the Colorado River in the Grand Canyon, are on hold until scientists find a way to protect and recover an endangered subspecies, the Kanab ambersnail.
Crawdads colonize the West's waterways
Exotic crayfish are invading streams throughout the West, and devastating the native crayfish and other riparian wildlife.
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