https://www.sciencetimes.com/articles/29126/20210115/feeding-hibernating-arctic-ground-squirrels-omega-3-fat-help-warm.htm
Researchers recently found that feeding arctic ground squirrels "omega-3 fatty acids that are common in flax seeds and fish oil" help keep the said animals...
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https://www.worldbank.org/en/news/video/2018/08/10/slideshow-resettling-european-ground-squirrels-in-bulgaria
The European ground squirrel, also known as European souslik, is a colonial animal that is known to dig extensive tunnel systems.
ground squirrelsslideshowresettlingeuropeanbulgaria