Grizzlies in Yellowstone National Park
In a preserve in Yellowstone I watched a test of some bear proof canisters. The rangers filled the canisters with food that was attractive to the grizzlies, and the bears set about trying to get the canisters open. This shot was taken of two grizzlies just before going after the canisters. You would not want to confront one of them in the open, but here it almost seemed like they were being playful. The canisters failed the test.