An article in Indian J Dermatol. 2014 Mar-Apr; 59(2): 163–165 States: “Finasteride is more effective for treating AGA patients who are pileous in other areas of the body.” This means that if Gorilla’s should bald, or apes should bald (which some Chimps are known to do), they may respond to finasteride better than their human cousins. OF course, not such study on balding Chimps, I believe, has been done.