of the Halkomelem word sásq’ets (, meaning "wild man") led him to believe that this was an actual creature. He theorized that sightings were due to small pockets of surviving gigantopithecines, with the progenitor population having migrated across the Bering land bridge, which was later used by humans to enter North America. (Gigantopithecus lived alongside humans but is thought to have gone extinct 100,000 years ago in eastern Asia, while the Bering land bridge existed between 135,000 to 70,000 years BP.) In January 1985 Krantz tried to formally name Bigfoot by presenting a paper at the meeting of the International Society of Cryptozoology held in Sussex, England, assigning it the binomen Gigantopithecus blacki, although this was not permitted by the International Commission on Zoological Nomenclature because G. blacki was an existing taxon and because the creature was lacking a holotype. Krantz argued that his plaster casts were suitable holotypes, later suggesting G. canadensis as a name, with the caveat that were Sasquatch found to be a member of the Homininae clade, the genus name could be Gigantanthropus in place of Gigantopithecus. Krantz then tried to have his paper, titled "A Species Named from Footprints," published in an academic journal although it was rejected by reviewers. After seeing footage stills of the Patterson–Gimlin film which appeared on the February 1968 cover of Argosy, Krantz was skeptical, believing the film to be an elaborate hoax, saying "it looked to me like someone wearing a gorilla suit" and "I gave Sasquatch only a 10 percent chance of being real." After years of skepticism, Krantz finally became convinced of Bigfoot's existence after analyzing the "Cripplefoot" plaster casts gathered at Bossburg, Washington in December 1969. Krantz later studied the Patterson–Gimlin film in full, and after taking notice of the creature's peculiar gait and purported anatomical features, such as flexing leg muscles, he changed his mind and became an advocate of its authenticity. While in Bossburg, he also met John Willison Green and the two remained friends until Krantz's death. The Cripplefoot tracks, left in snow, purportedly showed microscopic dermal ridges (fingerprints) and injuries tentatively identified as clubfoot by primatologist John Napier. Krantz asked Dutch professor A.G. de Wilde of the University of Groningen to examine the prints, who concluded that they were "not from some dead object with ridges in it, but come from a living object able to spread its toes." Krantz also attempted