The Mount

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The Mount is a 2002 science fantasy novel by Carol Emshwiller. It won the Philip K. Dick Award in 2002, and was also nominated for the Nebula Award for Best Novel in 2003.
The author was inspired to write The Mount after she took a class in the psychology of prey animals. After the class, Emshwiller wondered what it would be like if a smart prey animal rode a predator. The idea fascinated her enough to write a short story which became The Mount.