Hikers who visit Yosemite’s Grouse Lake via the Chilnualna Falls Trail often report hearing a distinct wailing cry like the sound of a puppy. According to Native American folklore, the sound is the cry of an Indian boy who drowned in the lake. Legend has it that he calls to hikers for help, but that anyone who ventures into the lake will be pulled under and drowned.
But the wailing boy isn't the park's only deadly spirit. The Miwok Indians believed Yosemite’s waterfalls were haunted by an evil wind called Po-ho-no, which entices people to the edge of the falls and then pushes them over the edge. In 2011, three hikers plunged to their deaths from the top of Yosemite’s Vernal Falls.