Daddy, can I has a pet fox please?

"Njet! Now go clean up your room." For most kids in Russia, this would have been the standard answer to their wishful request to own a pet fox. Unless their dad was the famous soviet geneticist Dmitry Belyaev. In 1959, Belyaev founded the Institute of Cytology and Genetics in Siberia and started a lifelong experiment to domesticate silver-black foxes. By selecting only for behavior, he obtained a tame fox population that started to show morphological and physiological changes not selected for but also present in many other domesticated species. These changes, including instances of pedomorphosis, suggest that behavioral traits favorable to domestication are genetically linked to morphological and physiological traits. So when his children asked him for a pet fox, Belyaev's answer might have been "Why, yes, of course! Just give me a couple of decades. And you must not forget: you become responsible, forever, for what you have tamed."
A video about the experiment. A Scientific American blog post about the experiment.

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