Mammals cloaca. Medical search. Frequent questions

The monotremes (egg-laying mammals) possess a true cloaca. (wikipedia.org)
This is one of the features of marsupials (and monotremes) that suggest their basal nature, as the amniotes from which mammals evolved had a cloaca, and probably so did the earliest mammals. (wikipedia.org)
There are four species of echidnas that, along with platypuses , make up a unique group known as monotremes - the smallest of the three mammal groups - whose members lay eggs like birds and fish, but also produce milk like other mammals. (livescience.com)
These are known as monotremes, a group of primitive mammals that lay eggs instead of giving birth to live young like most other mammals. (photographyreview.com)
It's worth noting that while monotremes are classified as mammals, they have some features that are more similar to reptiles, such as laying eggs and having a cloaca, which is a single opening for excretory and reproductive functions. (photographyreview.com)
Egg-laying mammals are called " monotremes ", a category that also includes the echidnas or spiny anteaters. (animalwised.com)
Together with the four species of echidna, it is one of the five extant species of monotremes, the only mammals that lay eggs instead of giving birth to live young. (absoluteastronomy.com)
It is still sometimes thought, for example, that the monotremes are "inferior" or quasi-reptilian, and that they are a distant ancestor of the "superior" placental mammals. (absoluteastronomy.com)

The norm in animals like reptiles, amphibians, birds and sharks, the cloaca is a common chamber where multiple body systems come together (the genital, intestinal and urinary tracts). (howstuffworks.com)
Testosterone is a steroid hormone from the androgen group and is found in mammals, reptiles, birds, and other vertebrates. (absoluteastronomy.com)
With anatomical and morphological characteristics seemingly belonging to reptiles, birds, and mammals, it simply did not fit into the existing classifications. (australianbookreview.com.au)
Birds, reptiles, and amphibians have a cloaca, which is a single opening used for excretion and often for giving birth or laying eggs too. (blubrry.net)
In adult birds, reptiles, amphibians, and many fishes but few mammals, cloaca is a common chamber into which the digestive, urinary and reproductive tracts discharge their contents. (lookformedical.com)
The only difference is that reptiles brumate and mammals hibernate. (flvs.net)

this is in contrast to most placental mammals, which have two or three separate orifices for evacuation. (wikipedia.org)
Most adult placental mammals have no trace of cloaca. (wikipedia.org)
However, some placental mammals retain a cloaca as adults: those are the tenrecs and golden moles (small mammals native to Africa), as well as some shrews. (wikipedia.org)
So instead of having a separate anus , reproductive organ and urethra all with their own exterior access, as is typical with placental mammals , their systems empty out into the cloaca. (howstuffworks.com)
Second, the tenrec has a cloaca, which is really unusual in placental mammals. (blubrry.net)
which in placental mammals is the primary communication route between the right and left brain hemispheres. (absoluteastronomy.com)

Although they're mammals, they lay eggs rather than giving birth to live young - although it has to be said that the platypus and echidna are extremely odd mammals and we shouldn't generalize based on them (but that is a discussion for a different article). (zmescience.com)
Does Any Mammal Lay Eggs? (photographyreview.com)
Ori Peretz) In a dramatic breakthrough with the potential to halt the destruction of some seven billion unwanted male chicks globally each year, Israeli scientists have produced a gaggle of hens all called Golda that are the first in the world to Does Any Mammal Lay Eggs? (photographyreview.com)
Yes, some mammals lay eggs. (photographyreview.com)
Your question's answer is no because a hen can lay eggs without mating a rooster.This bird is very unlike other mammals that need the male and female to mate for reproduction. (modernfarmertips.com)
To keep eggs about to be laid away from feces she inverts her oviduct within the cloaca so there is little or no contact inside her body between feces and egg, which comes out clean. (scoopfromthecoop.com)
Eggs are also laid through the cloaca. (typesofchicken.com)
The cloaca serves as the exit point for eggs, urine, and feces, with everything expelled together. (chickencyclopedia.com)
The cloaca serves as a multi-purpose exit for chickens, allowing them to expel eggs, urine, and feces all in one location. (chickencyclopedia.com)
While most mammals carry their offspring within the placenta and give birth to them live, platypuses lay eggs. (animalwised.com)
There are four extant species, which, together with the platypus, are the only surviving members of that order and are the only extant mammals that lay eggs. (absoluteastronomy.com)

During copulation, sperm is transferred from the male's cloaca into the female's cloaca via specialized structures called phalluses or intromittent organs. (wellfell.com)

They accomplish this by having a pair of accessory air bladders connected to the cloaca which can absorb oxygen from the water. (wikipedia.org)
Some turtles, including the bog turtle of the U.S. Appalachian mountain range, absorb oxygen from the water through the cloaca - a multipurpose tube and makeshift "butt" that serves breeding and egg-laying purposes, as well excreting waste. (snopes.com)

In the anatomy of some animals, a cloaca (/kloʊˈeɪkə/ kloh-AY-kə), PL: cloacae (/kloʊˈeɪsi/ kloh-AY-see or /kloʊˈeɪki/ kloh-AY-kee), is the rear orifice that serves as the only opening for the digestive, reproductive, and urinary tracts (if present) of many vertebrate animals. (wikipedia.org)
In lampreys and in some ray-finned fishes, part of the cloaca remains in the adult to receive the urinary and reproductive ducts, although the anus always opens separately. (wikipedia.org)
Being placental animals, humans have an embryonic cloaca which divides into separate tracts during the development of the urinary and reproductive organs. (wikipedia.org)
All human fetuses start off with a cloaca, but during a normal pregnancy it separates, forming the all-important urethra, anus and reproductive organ. (howstuffworks.com)
Chickens - much like other avians - possess a unique organ called the cloaca, serving the reproductive process in a way quite different from mammals. (typesofchicken.com)
However, their reproductive system differs from mammals in various ways. (wellfell.com)
The cloaca plays a crucial role in avian reproduction as it serves both excretory and reproductive functions. (wellfell.com)

Birds that mate using this method touch their cloacae together, in some species for only a few seconds, sufficient time for sperm to be transferred from the male to the female. (wikipedia.org)
The cloaca has an opening for expelling its contents from the body, and in females it serves as the depository for sperm. (dictionary.com)
However, the sperm do not flow through a central canal, as in mammals , but rather along grooves on the outside (Hutchins 2003). (newworldencyclopedia.org)
The hen raises its bottom, and the rooster vents its cloaca from the top and injects the sperm into the hen's opening. (modernfarmertips.com)
Then the sperm enters through the female cloaca and starts marching towards the ovary. (modernfarmertips.com)
The transfer of sperm happens quickly without the penetration normal in mammal mating. (scoopfromthecoop.com)
The cloaca, or vent, of the male and female touch and sperm are exchanged. (scoopfromthecoop.com)
The male brings his sperm to the female cloaca. (onews.info)
These sperm cells then travel through ducts called vasa deferentia towards an enlarged region known as the cloaca. (wellfell.com)

For help with their description, Vinther says, the study authors looked to the wide-ranging cloaca of other land-dwelling vertebrates. (dictionary.com)
In vertebrates [except mammals], the cloaca is the common opening at the end of the digestive tract through which both excretory and genital products are released). (calvertmarinemuseum.com)

Instead they coat their feces with uric acid that exits their body through the cloaca as moist chicken poop. (scoopfromthecoop.com)
they have a unique process involving their kidneys, uric acid, and the cloaca. (chickencyclopedia.com)
Their kidneys filter toxins and convert them into uric acid, which is then passed through the cloaca. (chickencyclopedia.com)
Uric acid combines with feces to create urine, which is expelled through the cloaca by chickens. (chickencyclopedia.com)
This biological adaptation also helps birds conserve water, as uric acid is less soluble in water than the urea excreted by mammals. (bigegghunt.net)

In the embryo, the embryonic cloaca divides into a posterior region that becomes part of the anus, and an anterior region that develops depending on sex: in males it forms the penile urethra, while in females, it develops into the vestibule that receives the urethra and vagina. (wikipedia.org)
Since the organs of both sexes have to pass through the stage of having a cloaca, anomalies occur in both, though the occurence in males is far less common than in females. (howstuffworks.com)
Males of all Anatidae, including the ducks, have a copulatory organ that is evaginated from the cloaca for copulation (Hutchins 2003). (newworldencyclopedia.org)
In mammals, testosterone is primarily secreted in the testes of males and the ovaries of females, although small amounts are also secreted by the adrenal glands. (absoluteastronomy.com)
Among humans and other mammals , males typically carry an X and a Y chromosome (XY), whereas females typically carry two X chromosomes (XX), which are a part of the XY sex-determination system . (artandpopularculture.com)
There is sexual dimorphism present with the males being slightly smaller, their tails are longer and thicker, and their cloaca is further down the tail while the female cloaca is at the tail base. (torontozoo.com)
Unlike mammals, who have separate openings for reproduction and waste elimination, female birds have only one opening called the cloaca - similar to males. (wellfell.com)

Mating through the cloaca is called cloacal copulation and cloacal kissing. (wikipedia.org)

In marsupials (and a few birds), the genital tract is separate from the anus, but a trace of the original cloaca does remain externally. (wikipedia.org)
The platypus is an egg-laying mammal or monotreme , as they have a cloaca instead of a specific genital opening to give birth. (animalwised.com)

Among fish, a true cloaca is present only in elasmobranchs (sharks and rays) and lobe-finned fishes. (wikipedia.org)

Even in the marsupials that have one, the cloaca is partially subdivided into separate regions for the anus and urethra. (wikipedia.org)
Unlike other marsupials, marsupial moles have a true cloaca. (wikipedia.org)
Marsupials are an infraclass of mammals, characterized by giving birth to relatively undeveloped young. (absoluteastronomy.com)

This non-moving collection of urine that humans have is a big deal if a cloaca is present. (howstuffworks.com)
Stool and urine blockages aren't the only problem with having a cloaca, however. (howstuffworks.com)
The urine of many intact male mammals has a more potent odor and is used for territorial marking. (dvm360.com)
Mammals produce liquid urine which leaves the body through the urethra. (scoopfromthecoop.com)
Not producing liquid urine allows birds to have lighter bodies than mammals of similar size. (scoopfromthecoop.com)
The answer lies in the fact that birds, unlike mammals, don't produce urine . (onews.info)
Unlike mammals, who have separate systems for removing solid wastes and urine (the digestive and urinary systems respectively), birds have one integrated system called the urinary-renal system. (bigegghunt.net)

BUT, when an egg comes out, the chicken's Cloaca is turned inside out so that the egg cannot come in contact with the intestines (fecal matter nastiness). (thankchickens.com)
A chicken's cloaca is an amazing organ. (scoopfromthecoop.com)

Being humans, it's fair to assume we get the gist of what mammals are - at least the basics. (zmescience.com)
Although the cloaca sounds efficient, when it occurs in humans it presents major challenges. (howstuffworks.com)
Why Don't Humans Have a Cloaca? (howstuffworks.com)
One of the reasons that a cloaca can't work in humans is because we have a bladder, whereas those other animals do not. (howstuffworks.com)
Unlike humans and most mammals, a female chicken has but one rear orifice with three functions. (thankchickens.com)
The cellular components and functions of the zebrafish liver are highly similar to mammals, and zebrafish develop many diseases that are observed in humans, including toxicant-induced liver injury, fatty liver, fibrosis, and cancer. (bvsalud.org)
Humans, like many other mammals, sweat. (utilitylifeadvice.com)

Excretory openings with analogous purpose in some invertebrates are also sometimes called cloacae. (wikipedia.org)
Figure 5H represents a section through the cloacal region, cl, showing the openings into the cloaca of the Wolffian ducts, wdo. (dictionary.com)
Some aquatic turtles, including the bog turtle, have openings off the cloaca, called bursae, which are densely laced with blood vessels," wrote the agency. (snopes.com)
Most mammals have separate openings for different uses. (blubrry.net)

All their waste gathers in an organ called the cloaca. (collisionprosinc.com)

Meanwhile, mammals have hair, give birth to live young, and the females produce milk from mammary glands - the structures for which the class is named. (zmescience.com)
The demonstration by researchers that castrated rabbit embryos of both sexes developed as females proved that testes are required for development of the male phenotype in mammals. (medscape.com)

What's the difference between birds and mammals? (zmescience.com)
Birds and mammals are equally remarkable, but very different. (zmescience.com)
The classes Aves and Mammalia are the only groups that have this special warm-blooded trait and that often leads people to think that birds and mammals are very related-sometimes even that birds are a type of mammal. (zmescience.com)
No genes are shared between the avian ZW and mammal XY chromosomes, and from a comparison between chicken and human, the Z chromosome appeared similar to the autosomal chromosome 9 in human, rather than X or Y, suggesting that the ZW and XY sex-determination systems do not share an origin, but that the sex chromosomes are derived from autosomal chromosomes of the common ancestor of birds and mammals. (artandpopularculture.com)

Chickens can't have sex like other mammals. (modernfarmertips.com)
Chickens do not have a urinary bladder and do not urinate like other mammals. (chickencyclopedia.com)
Unlike other mammals, chickens do not urinate because they lack a urinary bladder. (chickencyclopedia.com)
Following these practices can help prevent common issues with the cloaca in chickens and ensure proper waste excretion. (chickencyclopedia.com)

Without being certain, I'm convinced it derives from cloaca a primitive physical arrangement found in many non-mammals that functions as both waste tract and sexual organs. (blogspot.com)

Some mammalian smiles sport fangs, and the bird's mouth can be just as sharp, but it will never quite be able to give you back that excited grin-because, unlike mammals, birds don't have any teeth. (zmescience.com)
Unlike mammals, which typically have internal testes, male birds exhibit external testes located within their body cavity near the kidneys. (wellfell.com)

Besides, the platypus is among the rare venomous mammals . (animalwised.com)
The platypus is a semi-aquatic mammal endemic to eastern Australia, including Tasmania. (absoluteastronomy.com)

The next thing to note is the most obvious, the nice somewhat rounded feathery bodies and, where a mammal would have forelimbs, birds sport wings. (zmescience.com)

Both sexes have an opening called a cloaca that is used for mating and excrement. (typesofchicken.com)

A cross-section illustration of the internal anatomy of a male frog shows how all roads lead to the cloaca for urination, defecation and reproduction. (howstuffworks.com)
In addition to their distinctive shape, echidna penises are also unusual because, unlike those of most other mammals, they are used only for sexual reproduction and not urination. (livescience.com)

First proposed by Thomas Henry Huxley in 1880, it is nearly synonymous with the earlier taxon Marsupialia though it is slightly wider since it also contains the nearest fossil relatives of marsupial mammals.The earliest known. (absoluteastronomy.com)

Okay, so that's pretty yucky, but since nobody has ever heard of a cloaca, clacker is safe to be used in front of children, grandmas, etc) cooee noun/interjection - a high pitch cry used in the Australian bush to attract attention or denote one's location to those distant or unseen. (blogspot.com)

Some species have modified cloacae for increased gas exchange (see Reptile respiration and Reptile reproduction). (wikipedia.org)
One of the main reasons for neutering exotic pet mammals is to control reproduction. (dvm360.com)
The cloaca is the common passageway for urinary, digestion and reproduction ducts. (torontozoo.com)
Another intriguing aspect of male avian anatomy is the presence of a cloaca, an all-purpose opening used for both excretion and reproduction. (wellfell.com)

Instead of urinating and defecating separately like mammals, birds do them both at once through the same orifice, the cloaca. (bigegghunt.net)

The arrows show the direction that the poop stretched its way through the cloaca of the predator. (calvertmarinemuseum.com)

Finally, the fully-formed egg is laid through the cloaca. (wellfell.com)

Timeline of the disease event, in which encephalitis and death in wild mammals at a rehabilitation center occurred after systemic infection with highly pathogenic avian influenza A subtype H5N8, United. (cdc.gov)

Some species of turtles can breathe out of their cloaca when under water. (snopes.com)
In most species, castration makes male mammals less aggressive both to other animals and to their owners. (dvm360.com)

The beak, feet, and cloaca are the most common sites for these malignancies. (ivis.org)
Common issues with the cloaca can include vent gleet, improper diet, and dehydration. (chickencyclopedia.com)

Further, it appeared to lack mammary glands and therefore could not be classed as a mammal, yet it had obvious mammalian characteristics such as fur and a single bone comprising the lower jaw. (australianbookreview.com.au)
Found exclusively in mammals, hair is one of the defining characteristics of the mammalian class. (absoluteastronomy.com)

It was also noted that there was only one external body opening, the cloaca, into which the uteri, the gut, and the kidneys empty. (australianbookreview.com.au)

The cloaca in birds may also be referred to as the vent. (wikipedia.org)
Poor diets can lead to issues with the cloaca, such as vent gleet. (chickencyclopedia.com)

Mammals are members of a class of air-breathing vertebrate animals characterised by the possession of endothermy, hair, three middle ear bones, and mammary glands functional in mothers with young. (absoluteastronomy.com)

With the membrana, and internal iliacs on the rectum come in mammals. (ontopofmusic.com)

The cloaca of birds, our present-day dinosaurs, look "kind of like a cyst that needs to be popped," Vintehr explains, while the cloaca of crocodile are covered in distinct scales, forming a sort of raised lobe with a slit in the middle. (dictionary.com)
In an animal cloaca the ureter empties directly into the cloaca,' explains Dr. Richard Wood , chief of the department of Pediatric Colorectal and Pelvic Reconstructive Surgery at Nationwide Children's Hospital in Columbus, Ohio. (howstuffworks.com)

The cloaca serves as the main exit point for this waste and is crucial for its excretion. (chickencyclopedia.com)

Their cloaca - essentially their butt - has a lot of blood vessels so that is the most efficient way to get oxygen. (flvs.net)

These turtles spend so much time in water, they can not only use their lungs for breathing but can absorb oxygen through their skin, the lining of the throat and the cloaca. (torontozoo.com)

Letting water stream into their cloaca is an energy-efficient way to get oxygen. (flvs.net)

When not in use, your node is hammering from a preputial body from the cloaca. (mittersainmeet.in)

The cloacal kiss happens when the male cloaca and female cloaca meet with a transient touch. (onews.info)

To start with, mammals and birds are quite different through their very definitions. (zmescience.com)

Having a rooster in the flock lets people observe the rather unusual chicken mating process which is very different from how mammals mate. (scoopfromthecoop.com)

Most mammals , but also some insects ( Drosophila ) and plants ( Ginkgo ) use XY sex-determination . (artandpopularculture.com)

Even considering only the most standard mammal form, with four similarly-sized limbs and a tail, there is a notable difference in overall structure from birds. (zmescience.com)

It was related to the ancestors of a semiaquatic mammal called the otter-shrew, even though it's neither an otter nor a shrew. (blubrry.net)
This is how the first mammals, our distant ancestors, fed their offspring, about 187 million years ago. (utilitylifeadvice.com)

Less developed mammals, such as platypuses, do not have nipples. (utilitylifeadvice.com)

Anatomy1

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Monotremes8

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Female's cloaca1

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