It’s almost impossible to secure yourself against a food raid from bears. That’s because these giant mammals are clever tool users, and they share their tech knowledge with other bears nearby. As a result, bear-proofing technology rarely works for more than a couple of decades before every bear knows how to crack it.
https://gizmodo.com/were-in-a-technology-arms-race-with-bears-for-our-food-1682344883
