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 specifically is designed to debunk claims by creationists about the probability of naturalistic mechanisms like natural selection producing complex organisms.
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. In the book he gives various ideas about a seemingly complex mechanism coming about from many different gradual steps, that were previously unseen.
The book grew out of the annual Royal Institution Christmas Lectures which Dawkins delivered in 1991. It is illustrated by Dawkins' wife, Lalla Ward.
The book is divided into ten chapters as follows:

Facing Mount Rushmore
Silken Fetters
The Message From the Mountain
Getting Off the Ground
The Forty-fold Path to Enlightenment
The Museum of All Shells
Kaleidoscopic Embryos
Pollen Grains and Magic Bullets
The Robot Repeater
"A Garden Inclosed"