Although bear-related fatalities at Yellowstone National Park are quite rare (44 grizzly bear injuries throughout the entire history), deterrents are still important to keep them at a distance. One of these comes in the form of bear spray, "a fine cloud of Capsicum derivatives to temporarily reduce a bear's ability to [breathe], see, and smell" (https://www.nps.gov/yell/learn/nature/bearspray.htm). Below, Luke and Hannah operate bear spray on some fairly aggressive shrubbery:
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