Depuis les années 70, dans le parc national Joshua Tree, plusieurs témoins rapportent des rencontres avec une créature aux allures simiesques. D'aucuns croient plutôt à une blague perpétrée par les marins d'une base militaire de Californie. The Yucca Man, often described as a large and hairy desert beast, has been seen around Joshua Tree National Park. One possible explanation might include the unusual shape of the Joshua trees themselves, which can appear human in an instance of poor light. Reports date as far back as 1971, but some believe it is a recurring prank started at the nearhy Marine Base in Twenty-Nine Palms California.