Second Variety by Philip K. Dick
"Second Variety" is an influential short story by Philip K. Dick first published in Space Science Fiction magazine, in May 1953. It is one of Dicks many stories in which nuclear war has rendered the Earths surface to an uninhabitable, gray ash pile, and the only things remaining are killer robots. The short story "Jons World" (1954) revisited the claw-infested world of "Second Variety".