Menstruation
Most female mammals have an estrous cycle, yet only ten primates species, four bats species, the elephant shrew, and the spiny mouse have a menstrual cycle. The relatedness of these groups suggests that four distinct evolutionary events have caused menstruation to arise.
Menopause
Menopause has been observed in several species of nonhuman primates, including rhesus monkeys and chimpanzees. Menopause also has been reported in a variety of other vertebrate species including elephants, short-finned pilot whales, killer whales, narwhals, beluga whales, the guppy, the platyfish, the budgerigar, the laboratory rat and mouse, and the opossum. However, with the exception of the short-finned pilot whale, killer whale, narwhals, and beluga whales, such examples tend to be from captive individuals, and thus they are not necessarily representative of what happens in natural populations in the wild.