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Anyone who ever doubted the brute force of a full-grown grizzly bear had only to watch Bruno and Ozzy wander into a faux campsite at ZooMontana on Saturday.

In a matter of minutes, the tent, the chairs, the sleeping bag, a garbage can and most of the food containers set up in the bear enclosure were destroyed. All except on a bear-proof cooler that, no matter how hard they tried, neither bear could open.

Finally Ozzy, like Bruno before him, gave up and wandered away. The formerly intact campsite looked a little like a war zone.

A crowd was on hand for the afternoon demonstration of how bear-proof food coolers are (or aren’t). Kids and adults marveled at how one bear or the other would place his paws on a regular cooler or plastic keg, press with all his weight, and in seconds, cause it to explode.

Then the victor would enjoy his spoils — treats such as bear kibble, fresh or frozen fruit or peanut butter — placed there by the zoo staff.

The bears also had no trouble reaching up with their long, sharp claws to grab a box of food suspended by rope in a tree. And Bruno easily picked up and shook a sleeping bag that hid a cache of frozen pineapple.