Foxes bred for tameness Since 1959, researchers in Russia have been selectively breeding silver foxes for tameness. At each generation, only those foxes that show the least fear and aggression and the most affection to humans have been bred. The result, after more than 30 generations, is a breed of foxes that are as friendly to humans as are dogs (Kukekova et al., 2008; Trut, 1999).
RIA Novosti/Science Source