... de animais:
http://www.sciencemag.org/news/2018/08/these-docile-foxes-may-hold-some-genetic-keys-domestication
Citando:
"Kukekova first became aware of the celebrated “fox farm experiment” in 1988, when she was still a freshman at Saint Petersburg State University. In 1959, researchers took a group of wild silver foxes (a dark color mutation of the red fox) and bred only the most docile animals—those that didn’t bite when humans stuck fingers in their cages. The scientists then selected the tamest offspring of these animals and repeated the process over and over. By the eighth generation, the foxes started to seek out human company and show affection. (Today, nearly 60 years after the experiment began, some of them even enjoy belly rubs.)
In the 1960s, the scientists also bred a separate strain of foxes, selecting for aggressiveness. Over the generations, those animals were even less friendly toward humans than the other farm-raised foxes, attacking or growling at two-legged visitors as soon as they approached."
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