Last week, two teenagers camping at Yosemite were tragically crushed when a tree fell on their tent — which, as it turns out, is not a very common way to die at a national park.

Deaths are a fact of life in the national park system. However, despite a rash of misfortune this month that included a man being fatally mauled by a grizzly bear at Yellowstone and a French couple dying of heat exhaustion at White Sands National Monument, statistics show the nation’s 408 national park sites are relatively safe spots.