Climbing Mount Improbable is a 1996 popular science book by Richard Dawkins. The book is about probability and how it applies to the theory of evolution, and is designed to debunk claims by creationists about the probability of naturalistic mechanisms like natural selection.The main metaphorical treatment is of a geographical landscape, upon which evolution can only ascend in a gradual way, not being able to climb cliffs (this is known as an adaptive landscape).