Research from the University of California - Davis is the first one to measure personality in ground squirrels. It connects a number of human traits including being aggressive, athletic, bold, and sociable.
One finding says squirrels that showed an aggressive personality gave them better chances at getting a perch than shy ones. That in turn not only helped from evading predators, but also made the animals more sociable.
The rodents used for the research was the golden-mantled ground squirrel.
Source:Guardian
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