Fluke, or, I Know Why the Winged Whale Sings is the seventh novel by Christopher Moore. Published in 2003, it combines elements of absurdist and fantasy fiction, as well as the author's own brand of social commentary and humor. A serious theme in the novel involves environmentalism, particularly that associated with whales; and the author's personal research-experience with marine biologists helped to inform much of the story. An unabridged commercial audio cassette recording of Fluke has been issued with narration by Bill Irwin and whale songs.