In North Vancouver, Canada, a black bear regularly wanders through the neighborhood at night. Residents are tolerant, but one point of frustration for Curt Scheewe is that the bear frequently breaks through his fence while searching for food. And this has been going on for years. "I would spend time to fix it and replace boards, and after a while, he just kept breaking it down all the time so we just left the hole," Scheewe told Canada's Global News.

After ten years Scheewe has put up a new fence, which was swiftly broken. Scheewe's kids came up with the idea of installing a gigantic, one-meter-square dog door, which would allow the bear to move through the fence freely.

Scheewe had to experiment with the size and weight, making the door heavy enough that a bear could push through, but a dog or coyote couldn't. Regular hinges wouldn't work, so he improvised by using copper pipes as pivot points.

The design worked:

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