Until you have had a bear attack, you have no idea of it's power and strenght. You can't just put up a stronger fence or a piece of plywood. A bear can tear a door of a car to get a piece of candy left inside. In one case here of bear tore a steel security door off a powder shed (a building that dyamite is kept in) to get a men's lunch. Anything short of a 3/8 inch steel plate box with a welded hasp and strong lock WILL NOT keep a bear out. There are times when faced with a bear you can back off and walk away. Any other time the bear must meet it's maker. Anyone that is not willing to KILL a bear, should NOT have children or animals in bear country. I won't add photos of dead bear and for some strange reason can't post photos here. But I can e-mail photos of the trap the state of Ca. will send out if you have a problem bear. But usless the bear has attacked a human, you must get on a waiting list for they only have about a hundred of them. I have spent many hours and more money than I want to admit to, just to keep bears off my property. I not enjoy them killing my chickens and I don't enjoy killing them. So far those that have reached the chickens have met their maker. In every case a bear can't stand up to an arrow or a bullet. That is the only way to deal with a chicken kill bear.