Squirrels, however, do fine. Some squirrels running around with extremely high steroid hormone levels, which help them build muscle before hibernation. But how do they avoid all the negative ...

In the summer, Arctic ground squirrels of both sexes have levels of testosterone and other "male" steroid hormones or androgens in their blood that are 10 to 200 times that of other ground squirrels.

The researchers report that the arctic squirrel increases its muscle mass 30 per cent over the summer and does so by producing high levels of testosterone and other anabolic steroids. Typically ...

And they do it without suffering the harmful effects that high levels of testosterone and other anabolic steroids usually cause. Researchers have started to untangle how the squirrels manage it ...

Yes, Arctic ground squirrels really do pump themselves up on steroids every summer -- though the process is natural, and doesn't involve any competitive doping. But researchers think they've ...

Thirteen-lined ground squirrels resemble chipmunks on steroids. They're about the same length as a chipmunk - 10 inches from tip of nose to tail - but can be double the weight. The rodents are ...

Colleagues giggled at the mere mention of what amounts to squirrels on steroids, but Ald. Howard Brookins (21st) was dead serious. “It’s a pet peeve. It does invoke some giggles. But we are ...

Rodents pumped up on steroids run wild across the Canadian tundra each summer. Now, new research has uncovered how they do it without succumbing to nasty side effects like "roid rage." In the summer, ...