The Sacred Book of Dinosaur is an ancient book of dinosaur lore and customs, as featured in two early Dinosaurs episodes, "Episode 105: The Howling" and "The Golden Child". Earl Sinclair described it in "The Howling" as having been written by "some sacred guy," while an Elder in "The Golden Child" calls it "the wisdom of the ages handed down from the beginning of time." The book contains many customs which dinosaurs are commanded to obey (but none so important as the Howling) and various prophecies, which prove in reality to be either metaphorical or of dubious accuracy.