: He argues that tameness is not just a behavior but is rooted in genetics, specifically affecting developmental processes that make animals more cooperative and less aggressive.
is the Spanish edition of Richard C. Francis's acclaimed science book, originally titled Domesticated: Evolution in a Man-Made World . In this work, neurobiologist Richard C. Francis explores the profound biological and evolutionary changes that have occurred in animals—and humans—through the process of domestication. Core Themes and Concepts
: A central thesis of the book is that humans are also domesticated. Francis suggests our species underwent a "self-domestication" process, where selection for high sociality and cooperation allowed us to dominate the planet. Structure of the Book
: Francis details how selecting for a single trait— tameness —unintentionally triggers a suite of physical changes. These include floppy ears, shorter snouts, smaller brains, and unique coat colors, a pattern seen across diverse species from dogs and cats to reindeer and camels.
The narrative is divided into chapters that act as individual case studies for different species: