Some evidence supports both of the claims that the extinction of "P. goliah" may have been due to climate shifts during the Pleistocene or to human hunting. "P. goliah", depending heavily on free-standing water, was more vulnerable to drought. This can explain why the red kangaroo survived the increasing aridity and "P. goliah" did not. However, there is also evidence that suggests that humans could have a significant influence in the extinction of "P. goliah". "P. goliah"s need for a constant free-standing source of water, plus its height and common habitat in open shrublands, made it more noticeable to human hunters, thus making it vulnerable to humans, who were also water-bound like it was.