If you happen to be scared of snakes (like any sane person) then stay as far away from the Canadian province of Manitoba during spring. For you see, the World’s largest gathering of snakes takes place there every year when thousands of snakes gather at the Narcisse Snake Dens.

Each spring in the Canadian province of Manitoba, 75,000 red-sided garter snakes (Thamnophis sirtalis infernalis) congregate inside limestone caves to form ‘mating balls’ – writhing heaps of up to a hundred males tussling for a single female.

This is the biggest gathering of snakes in the world, a phenomenon that can only happen here because of two geological factors – limestone crevices and marshes. According to an interview National Geographic did with environmental documentary photographer, Paul Colangelo, the area is perfect during summer because the snakes can feed off the wealth of frogs that live in the marshes, and in winter, those limestone crevices provide fantastic shelter deep underground. Which is just as well, because winter temperatures in Manitoba can dip down to -40 degrees Celsius.