Here are 10 animals that have some of the highest levels of testosterone and the impact it has on their behavior and characteristics.

PCOS is the most common cause of high testosterone in women, affecting about 10% worldwide. Some medications and supplements, like anabolic steroids and DHEA, can increase testosterone levels. An ...

This article was reviewed by Darragh O’Carroll, MD. There’s a commonly held stereotype that men with high testosterone levels are aggressive beefcakes who are prone to “roid rage,” ready to throw a ...