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

The local limestone karst, hollowed out by thousands of years of erosion, is riddled with vast underground caverns : these are where the snakes 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. The local limestone karst, hollowed out by thousands of years of erosion, is riddled with vast underground caverns : these are where the snakes 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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