Beckjord explained away the need for physical evidence, such as hair, blood and bones, to prove the existence of Bigfoot by arguing that the creature is an "inter-dimensional shape-shifter that can warp in and out of physical reality." He theorized that they may be "the product of tulpas or thought forms created by people or other entities." In an editorial for the journal Current Anthropology, Beckjord argued that the study of the "wild man", Sasquatch, was "the proper study of either parapsychologists or Search for Extraterrestrial Intelligence scientists, not anthropologists."