The spring migration of the red sided garter snake.
Thamnophis sirtalis parietalis.

 "Man remains the main threat to this population", points out Robert Mason. Agriculture pollutes the water table and destroys the marshlands where grass snakes feed while mining and road works churn up the underground areas where they hibernate.  

It is the largest concentration of snakes in the world.  Every springtime in Narcisse, in the Canadian province of Manitoba, tens of thousands of them burst out of holes in the rocks where they have been hibernating.   (image by Olivier Blaise)
The spring migration of the red sided garter snake. Thamnophis sirtalis parietalis. "Man remains the main threat to this population", points out Robert Mason. Agriculture pollutes the water table and destroys the marshlands where grass snakes feed while mining and road works churn up the underground areas where they hibernate. It is the largest concentration of snakes in the world. Every springtime in Narcisse, in the Canadian province of Manitoba, tens of thousands of them burst out of holes in the rocks where they have been hibernating.
©Olivier Blaise
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