In the world of massively multiplayer online games (MMOGs), Faunasphere was but a blip on the screen in its short public life from 2009 to 2011. Its devoted players, many of them middle-aged women, entered a world that did not build on common fantasy or science-fiction tropes. There was no evil to defeat or realms to conquer, only friendly animals to care for and pollution to fight. In Players and Their Pets, Mia Consalvo and...