The town of Churchill, Manitoba, Canada bills itself as "The Polar Bear Capital of the World." It's not a joke. These dangerous predators routinely wander into town. The bears have impacted local customs, as writer Zac Unger describes:
"We were in this town in northern Manitoba where polar bears literally will walk down Main Street. There are polar bears in this town. People will leave their cars and houses unlocked, and it's perfectly good form just to duck into any open door you can find when there's a polar bear chasing you.
"People use what they call Churchill welcome mats, which is a piece of plywood laid down in front of the door or leaned up against the door with hundreds of nails sticking out so that when the polar bear comes up to pad across your porch, he's going to get a paw full of sharp nails."