A long-term experiment in Siberia successfully domesticated silver foxes by selectively breeding for tameness over decades. These foxes developed dog-like behaviors, including tail wagging and seeking attention, demonstrating how quickly selective breeding can alter an animal's disposition and physical traits, such as snout length and ear shape.

Impact: High. Illustrates the profound impact of selective breeding on animal behavior and evolution, offering a tangible example of domestication.

In the source video, this keypoint occurs from 00:28:50 to 00:31:20.

Sources in support: Brian Simpson (Guest)