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Thanks for the details. The rest of the mammals aside from the three menopausal ones are fertile unto death? Do they have anything to substitute for menstrual cycle, or lack the uterine tissue build-up that occurs in menstruating mammals. Am I correct or not on the 'no new eggs after birth'...

Hey all. In the mammalian male, I understand that from puberty onward, through death, males of the species constantly produce viable sperm and exhibit secondary sex characteristics. Hormone levels may drop along with sperm counts and sperm quality, but the males keep "shooting live rounds". For...