Other menstruating primates, some of the menstruating bat species, and the elephant shrew all engage in extended copulation. Petrosaltator Elephant shrew, (order Macroscelidea), any of approximately 20 species of rat-sized African mammals named for their long, tapered, and flexible snout (proboscis). A girl can dream (and in fact, there are a few theories as to why having an actual menstruation is an evolutionary advantage). In addition, there is compelling evidence for menstruation in elephant shrew, which is a small-size mammal found exclusively in Africa. Then, turning its head to one side, it chews pieces off with its cheek teeth, much like a dog chewing a bone. An elephant shrew uses its nose to find prey and uses its tongue to flick small food into its mouth, much like an anteater. Social behaviors are not very common and they even have separate nests. After a gestation period varying from 45 to 60 days, the female will bear litters of one to three young several times a year. Longest Gestation Period. [10] Their dental formula is 1-3.1.4.23.1.4.2-3G. Some larger elephant shrews, such as Petrodromus tetradactylus and Rhynchocyon chrysopygus, are snared and eaten by natives. If you type ‘natural menstruation’, ‘free flow’, free bleeding’ etc. The elephant shrew hunts during the day and prefers to stay in cover and shadow to catch its prey. Most female mammals have an estrous cycle, yet only ten primate species, four bat species, the elephant shrew and the spiny mouse have a menstrual cycle. Breeding. The reasons behind the two strategies are unclear. This post is prompted by the discovery in Namibia of a new species of elephant shrew or sengi, the smallest yet of the 19 species in the Order Macroscelidea. 2. The life span in the wild is probably 18 months or less, but captive North African elephant shrews lived 40 months. Many others have menstrual cycles, but reabsorb the old womb-lining rather than bleed it out. Although mostly diurnal[11] and very active, they are difficult to trap and very seldom seen; elephant shrews are wary, well camouflaged, and adept at dashing away from threats. Elephant shrew, a species that is strictly native to Africa is also part of the placental mammals with overwhelming evidence from research that indicates menstruation in them. Some do – apes, old-world monkeys, elephant shrews (above), many bats and a single rodent: the spiny mouse. [10], After five days, the young's milk diet is supplemented with mashed insects, which are collected and transported in the cheek pouches of the female. Elephant shrews can be found inhabiting forests, jungles, grasslands and dense woodland all across Africa. The reasons behind the two strategies are unclear. in dogs and tree shrews. The young when born have all their hair and have their eyes open. into your Internet search engine, you will get all kinds of results ranging from facts to myths to activism. A chicken is no mammal. All have slim bodies, slender limbs, and very long hind legs and feet. Their lifespans are about two and a half to four years in the wild. Females of other species of placental mammal undergo estrous cycles, in which the endometrium is completely reabsorbed by the animal (covert menstruation) at the end of its reproductive cycle. Elephant shrews are not highly social animals, but many live in monogamous pairs, which share and defend their home territory, marked using scent glands. Other than humans, menstruation only occurs in females of certain species of apes, also in bats and the elephant shrew. Without pads, tampons, cups or otherwise? Our understanding of the specific mechanisms underlying menstruation is limited by the small number of species which experience menstruation as a normal physiological process; menstruation occurs in only a very few mammals—women, old-world primates, some bats, the elephant shrew and the spiny mouse. [15], A number of fossil species are known, all from Africa. Some elephant shrews also feed on small amounts of plant matter, especially new leaves, seeds, and small fruits. The mating period for elephant shrews lasts for several days. – Source. [12], Female elephant shrews undergo a menstrual cycle similar to that of human females and the species is one of the few nonprimate mammals to do so. Humans, other apes, and old world monkeys menstruate. All have slim bodies, slender limbs, and very long hind legs and feet. Females of other species of placental mammal undergo estrous cycles, in which the endometrium is completely reabsorbed by the animal (covert menstruation) at the end of its reproductive cycle. In addition, there is compelling evidence for menstruation in elephant shrew, which is a small-size mammal found exclusively in Africa. [5], They are widely distributed across the southern part of Africa, and although common nowhere, can be found in almost any type of habitat, from the Namib Desert to boulder-strewn outcrops in South Africa to thick forest. Elephant shrews are small, quadrupedal, insectivorous mammals resembling rodents or opossums, with scaly tails, long snouts, and legs quite long for their size, which are used to move from one place to another like rabbits. While this battle has helped popularise thes… Although the size of the trunk varies among species, all are able to twist it about in search of food. Elephant shrews, or sengis, are small African mammals. Other menstruating primates, some of the menstruating bat species, and the elephant shrew all engage in extended copulation. Breeding. But why do humans menstruate, when most animals don’t? But most of them have a covert menstruation. [13] Elephant shrews were used in the 1940s to study the human menstruation cycle. … [7] Compared to other mammalian insectivores, sengis have relatively large brains. Many others have menstrual cycles, but reabsorb the old womb-lining rather than bleed it out. [18] Although macroscelids were classified in the past with many groups, often on the basis of superficial characteristics, considerable morphological and molecular evidence places them within Afrotheria, at the base of Afroinsectivora. The other two lucky animals are bats and a type of shrew. And if menstruation leaves an animal more susceptible to predation, the shrew may have adapted by becoming a nasty little bugger. In most mammals transformation of the endometrial stroma to decidua occurs only following implantation. Elephant shrew is small mammal that, despite its name, belongs to the group of animals called sengis. Elephant shrews, or sengis, are small African mammals. Menstruation cycle and period in elephant shrew lasts for nearly the same period as observed in humans. 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. Macroscelididae: Elephant Shrew Family. 3. Galegeeska The 20 species of elephant shrew are placed in six genera, three of which are monotypic: "Chrysochloridae (Mammalia) from the Lutetian (Middle Eocene) of Black Crow, Namibia", "Molecular evidence for multiple origins of Insectivora and for a new order of endemic African insectivore mammals", "Elephant shrew rediscovered in Africa after 50 years", "Secrets of the sengi: the world's fastest small mammal", "Brain Volume of the Newly-Discovered Species, "Short-eared elephant-shrew (Macroscelides proboscideus) - A "living fossil" from the Namib-desert", "Classics revisited: C. J. Menstruation has not been detected or studied in the majority of bat species; thus, it is unclear if menstruation evolved twice within Chiroptera or is more widespread in the clade. Exceptions are the catarrhine primates, including humans; if pregnancy does not ensue the decidua is shed together with blood and fluids (see, Placentation in elephant shrews was studied by van der Horst and others and more recently has been described by Dominic Oduor-Okelo (. The menstrual cycle occurs due to the rise and fall of hormones. There are cases of bleeding in other mammalian species, e.g. [17], Elephant shrews mainly eat insects, spiders, centipedes, millipedes, and earthworms. Menstruation in other animals occurs in primates, such as apes and monkeys, as well as bats and the elephant shrew. Elephant shrew is more closely related to aardvarks, elephants, moles and tenrecs than to true shrews. They can even be found in the Namib Desert, one of the driest regions of the earth. Elephant shrews are not, in fact, shrews. The short-eared elephant shrew has an average size of 150 mm (5.9 in). The relatedness of these groups suggests that four distinct evolutionary events have caused menstruation to arise. The young are able to move around directly after birth. However, phylogenetic analysis revealed that elephant shrews are not classified with true shrews, but are in fact more closely related to elephants than shrews. In 1997, the biologist Jonathan Kingdon proposed that they instead be called "sengis" (singular sengi),[4] a term derived from the Bantu languages of Africa, and in 1998, they were classified into the new clade Afrotheria. [10] Rhynchocyon species also dig small conical holes in the soil, bandicoot-style, but others may make use of natural crevices, or make leaf nests. Talking about our menstrual flow, you might wonder just what would we do without our menstrual products? 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