A Million Penguins was a collaborative effort to write a novel. The web site through which the novel was written used a wiki for the authors to add their submissions. Due to the overwhelming number of edits, over 100 every hour, Penguin had to impose "reading windows" whereby they freeze the novel so that the more serious editors can read over what has been changed and thus get their bearings on where the story is going.On March 7, 2007, the Penguin Books UK blog announced that the project had come to an end.Penguin put a lot of effort into advertising the wiki-novel.