Pack rats had annexed a battered, faded-blue Dodge van and filled it, floor to ceiling, with cholla cactus. Another rat duo—they’re usually mother-daughter pairs—lived in a fairly new range: it lay on its back, the burner holes serving as windows. I opened the oven door (the roof) and looked down into the chambers. The rats weren’t home, but the clippings were still green. Nice digs.