Periwinkles: the Snail Not the Flower
Submitted by Steve Roark on Mon, 03/18/2024 - 18:37Anyone who has hiked and crossed a mountain stream or took a cold drink out of a spring has likely seen periwinkles, which look like small black pebbles scattered about in the water. Closer inspection reveals that they are freshwater snails. I’ve been told by my older kin that seeing these little guys in a stream indicated that the water was clean enough to drink. I wouldn’t go that far about the purity of the water, but they are partially right in that these snails are environmentally sensitive and good indicators of unpolluted streams.