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codece t1_jegya76 wrote

From Wikipedia:

>The Narcisse Snake Dens is a provincial wildlife management area located in the Rural Municipality of Armstrong about 6 km north of Narcisse, Manitoba. The dens are the winter home of tens of thousands of red-sided garter snakes. These pits are the largest known concentration in the world of this particular type of snake.

They are gathering together to mate.

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