Not necessarily Sasquatch related but here is a photo of a chimpanzee with severe alopecia (hair loss) revealing his natural density of muscle.
According to the Smithsonian: “A chimpanzee had, pound for pound, as much as twice the strength of a human when it came to pulling weights. The apes beat us in leg strength, too, despite our reliance on our legs for locomotion. A 2006 study found that bonobos can jump one-third higher than top-level human athletes, and bonobo legs generate as much force as humans nearly two times heavier.” ... See more