Domesticated foxes display increased size in brain regions

(Harvard University) By analyzing MRI scans of the foxes, Hecht and her colleagues showed that both the foxes bred to be tame and those bred for aggression have larger brains and more grey matter than the brain of the control group (the foxes not bred for any particular behavior). These findings run in contrast to studies on other animals that have shown domesticated species have smaller brains with less grey matter, than their wild forebears.
Source: EurekAlert! - Biology - Category: Biology Source Type: news