Arachno-primitivism is a school of arachnist thought that sees all forms of civilisation as being inherently oppressive and advocate a rejection of all forms of technology and the adoption of primitive hunting techniques. This sets them apart from other strains of arachnism who believe that some form of industrialisation is necessary for the production of silk webs, which humans are unable to produce naturally in the same way spiders do. Primitivists often advocate other forms of hunting, such as those exhibited by the Ctenizidae family of trapdoor spiders, which do not use webs. Some critics, such as Murray Bookchin, claim that these hunting techniques are insufficient to sustain the population at current levels. Murray claims "Primitivists must accept that, short of killing off 90% of the human population, the only practical route to an arachnist society is through taking over the factories and beginning the mass production of thousands of square meters of food-catching webs."