Which animal was part of an Russian domestication experiment in 1959?

The Russian domestication experiment in 1959 involved foxes. It aimed to study the process of domestication by selectively breeding foxes for tameness over generations. The experiment began with wild foxes and only allowed the individuals that displayed the least fear towards humans to breed. This process continued for several generations, resulting in a population of foxes that displayed traits similar to domestic dogs, such as floppy ears, curled tails, and a desire for human affection. The experiment provided valuable insights into the genetic and behavioral mechanisms associated with the domestication of animals.