Does any other mammal have a menstral cycle besides humans?
543627
Sure, all do. Its called oestrus cycle in most animals. The menstural cycle is what it is called in primates. All primates (monkeys, etc) have a menstral cycle.
547192
Estrus: is in some-most mammals, but not primates who have menstrual cycles.  It is spelt a couple ways if you want to do more searches on it: estrus, oestrus. Refers to period of fertility (usually with a bloody show) when female is "in heat," is usually willing to mate and has viable-mature eggs ready and waiting. Some animals are spontaneous ovulators AND have an oestrus cycle.  Presence of penis in vagina (mechanical stimulation) causes the eggs to be released at mating.  Cats for example....notice the barbs on the male cat's penis before?
1012920
Similar to circadian rhythms (daily rhythms), healthy women who are ovulating have another rhythm controlled by hormones-commonly known as their "period."  The cycle is about 28-days.  Interestingly enough, this about coincides with the cycle of the moon and there are animals which only mate during a full moon.  Although not proved, it is possible that somewhere in our evolutionary past, we had an ancestor who found that mating during a full moon improved its chances of survival.  Another theory is that the 28-day cycle prevents multiple pregnancies (i.e., multiple fertile eggs in the uterus) with multiple ages--something that could be harmful to the woman's and fetus's health.
498466
imblesing75 said : >>>>pigs and humanssweat through the entire surface of their skin.\n\nThis is in no way true. Pigs have few functional sweat glands than almost any other species of mammal. Pigs sweat ONLY through their snout.
666246
Only the members of family Hominidae (man, the chimpanzees, gorillas and orangutans) have a menstrual cycle. The discharge from dogs and other mammals (all other mammals undergo estrus) doesn't correspond to the same phenomenon. \nThe changes during the menstrual cycle occur mainly at the endometrium (the inner lining of the uterus), whereas the major changes during estrus occur at the vaginal epithelium. In menstruating animals, the discharge of blood is formed by the endometrial walls and occurs when there is no fertilization. In other mammals, there may be some bloody vaginal discharge, but the endometrium is reabsorbed if no fertilization occurs (no menses).
454709
Human are unique in having a monthly cycle.  Most mammals have a strict breeding season.  As set by that breeding season, other mammals will undergo a process like menstruation.  These would be whales, dolphins, seals, sea lions, sea otters, dugongs, etc.
310750
In contrast to most mammals, humans do not have an all-embracing intense hair on their body. Several theories have been advanced to explain the bareness of human body hair. One suggests that nature selected humans for shorter and thinner body hair as part of a set of adaptations including bipedal locomotion and an upright posture. There are several problems with this savanna theory, not least of which is that cursorial hunting is used by (other) animals that do not show any thinning of hair, and that hair similar to chimpanzees and gorillas also shades the skin from radiant heat and protects it from hot winds, and thus another mechanism for heat loss is not required. Another problem is that bipedal locomotion apparently now predates hominids moving from a forest environment to a savanna environment. A more recent theory for human hair loss has to do with a possible period of bipedal wading in a salt marsh in the Danakil region of Ethiopia, possibly occurring in the hominid lineage between 5 and 7 million years ago. As a wading animal, it was more efficient to develop short body hair and a layer of subcutaneous fat for streamlining and insulation in the aquatic environment; the eccrine sweat glands developed later after the hominids left the water; see Aquatic ape hypothesis. One problem with this theory is that both chimpanzees and gorillas have the same density and distribution of the eccrine glands, but that they have not been developed for sweat production.\n\nA third theory for the thin body hair on humans proposes that Fisherian runaway sexual selection played a role here (as well as in the selection of long head hair). Possibly this occurred in conjunction with neoteny, with the more juvenile appearing females being selected by males as more desirable; see types of hair and vellus hair. The human female body hair typically has more vellus hair (making the skin appear bare), while the male body typically has more terminal hair (especially on the chest, abdomen and back). Thus sexual selection can explain the sexual dimorphism in human body hair, with the results of selection being more evident (more extreme) in the female than in the male, a point which the other two theories cannot address without proposing substantially different behavior between males and females. Also, we see that artificially bare (shaved, etc.) legs, arms, etc. on women are seen as "sexy" even today, while body shaving is not nearly as common for men.
486303
It sounds pretty normal.  Just keep track and if it doesn't get better go to the doctor.\n\nThe normal menstrual cycle in humans\nWomen show considerable variation in the lengths of their menstrual cycles, and the length of the menstrual cycle differs in different animals (see below).\n\nWhile cycle length may vary, 28 days is generally taken as representative of the average ovulatory cycle in women. Convention uses the onset of menstrual bleeding to mark the beginning of the cycle, so the first day of bleeding is called "Cycle Day one".
655903
For example, women with very low body fat, such as athletes, may cease to menstruate. The presence of menstruation does not prove that ovulation took place; women who do not ovulate may have menstrual cycles. Those anovulatory cycles tend to take place less regularly and show greater variation in cycle length. In addition, the absence of menstruation also does not prove that ovulation did not take place, because hormone disruptions in non-pregnant women can suppress bleeding on occasion. \n\n\nThere are a few african tribes whose women ovulate...but don't menstruate...reabsorbing the endometrium if conception does not occur during that cycle. The endometrium is reabsorbed into the body instead of breaking down into blood-like products and leaving the body.\n     Sorry I can't give you a site to go to. I grew up in West Africa...where I realized that there was a difference between some of the 'country' girls not swayed by the allure of the western style who never menstruate...and those who had left 'up country' to come to the big cities and started bleeding for the first time, within a couple of years of living the city life.\n    Some vegetarian women stop menstruating all together after first detoxifying their body. Years later menstraution drops off to a trickle, then nothing as the egg is reabsorbed by the body.
278829
There could be a number of reason.  Perhaps because its precieved as naughty and taboo?  There is also extra lubrication because of menstral blood.  It can also be a pheromone deal.  Female animals menstrate when they go into heat and release pheromone that attract male mates, perhaps on a subconcious, primal level thats why his attraction is stronger.  \n\nMost woman become more aroused before, during or after that special week, so if a guy is okay with it, its a good thing.
1110735
The quick answer is NO.  There are two types of mammals when it comes to the menstruation cycle: Menstrual, like humans and some primates, and Oestrous, like most marine mammals, etc. In oestrous mammals the luteal phase is greatly reduced compared to the menstrual mammals. So there is little or no proliferation of the endometrium (i.e. lining of the uterus) and therefore no precipitous shedding of the endometrium.
85714
I believe one is produced by female human the other endometrial by a pregnant female horse.
188744
The menstrual cycle is regulated by luteinizing hormone, follicle stimulating hormone, estrogen and progesterone.  Since all of these are hormones, we can say the menstrual cycle is regulated by the endocrine system.
190202
Great apes do too. \n\n"Females of other mammalian species go through certain episodes called "estrus" or "heat" in each breeding season. During these times, ovulation occurs and females become receptive to mating, a fact advertised to males in some way. If no fertilisation takes place, the uterus reabsorbs the endometrium: no menstrual bleeding occurs. Significant differences exist between the estrus and the menstrual cycle. Some animals, such as domestic cats and dogs do produce a very short and mild menstrual flow. However, due to its small amount (and personal cleanliness in cats) it passes pet owners largely unnoticed."\n\nI couldn't find exactly WHY though.
453444
From http://en.wikipedia.org/wiki/Menstrual_cycle\n\nOnly human beings and the great apes experience a true menstrual cycle. Most placental mammals experience estrus instead. The menstrual cycle is under the control of the reproductive hormone system and is necessary for reproduction. In women, menstrual cycles occur typically on a monthly basis between puberty and menopause.\n\nDuring the menstrual cycle, the sexually mature female body releases one egg (or occasionally two, which might result in dizygotic, or non-identical, twins) at the time of ovulation. The lining of the uterus, the endometrium, builds up in a synchronised fashion. After ovulation, this lining changes to prepare for potential implantation of the fertilized egg to establish a pregnancy. If fertilization and pregnancy do not ensue, the uterus sheds the lining and a new menstrual cycle begins. The process of the shedding of the lining is called menstruation. Menstruation manifests itself to the outer world in the form of the menses (also menstruum): essentially part of the endometrium and blood products that pass out of the body through the vagina. Although this is commonly referred to as blood, it differs in composition from venous blood.\n\nCommon usage refers to menstruation and menses as a period. This bleeding serves as a sign that a woman has not become pregnant. (However, this cannot be taken as certainty, as sometimes there is some bleeding in early pregnancy.) During the reproductive years, failure to menstruate may provide the first indication to a woman that she may have become pregnant. A woman might say that her "period is late" when an expected menstruation has not started and she might have become pregnant.\n\nMenstruation forms a normal part of a natural cyclic process occurring in healthy women between puberty and the end of the reproductive years. The onset of menstruation, known as menarche, occurs at an average age of 12, but can occur any time between the ages of 8 and 16.[1] However, the condition precocious puberty has caused menstruation to occur in girls as young as 8 months old. The last period, menopause, usually occurs between the ages of 45 and 55. Deviations from this pattern deserve medical attention. Amenorrhea refers to a prolonged absence of menses during the reproductive years of a woman for reasons other than pregnancy. For example, women with very low body fat, such as athletes, may cease to menstruate. The presence of menstruation does not prove that ovulation took place; women who do not ovulate may have menstrual cycles. Those anovulatory cycles tend to take place less regularly and show greater variation in cycle length. In addition, the absence of menstruation also does not prove that ovulation did not take place, because hormone disruptions in non-pregnant women can suppress bleeding on occasion.\n\nWomen show considerable variation in the lengths of their menstrual cycles, and the length of the menstrual cycle differs in different animals.\n\nWhile cycle length may vary, 28 days is generally taken as representative of the average ovulatory cycle in women. Convention uses the onset of menstrual bleeding to mark the beginning of the cycle, so the first day of bleeding is called "Cycle Day one".\n\nOne can divide the menstrual cycle into four phases:\n\nMenstruation\nEumenorrhea denotes normal, regular menstruation that lasts for a few days (usually 3 to 5 days, but anywhere from 2 to 7 days is considered normal.[2] The average blood loss during menstruation is 35 millilitres with 10-80 mL considered normal;[3] many women also notice shed endometrium lining that appears as tissue mixed with the blood. An enzyme called plasmin — contained in the endometrium — inhibits the blood from clotting. Because of this blood loss, women have higher dietary requirements for iron than do males to prevent iron deficiency. Many women experience uterine cramps, also referred to as dysmenorrhea, during this time
1069981
Menstruation is a characteristic of  placental mammals. It is a process where by the uterus gives off its unused inner layer because the egg was never fertilized.  Birds and reptiles do not contain a uterus.  They lay a hard shelled egg called the amniotic egg.  Basically they leave the eggs alone to develop on their own.  When they hatch they usually fend for themselves except for the birds that watch over their chicks.
602360
The estrous cycle (also oestrous cycle; originally derived from Latin œstrous) refers to the recurring physiologic changes that are induced by reproductive hormones in most mammalian placental females; humans and great apes are the only mammals who undergo a menstrual cycle instead. Estrus cycles start after puberty in sexually mature females and are interrupted by anestrous phases. Typically estrus cycles continue until death. Some animals may display bloody vaginal discharge, often mistaken for menstruation.