Review of: Platipus

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Great Mom Platypuses Laying Eggs And Cute Platypuses Moments

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Platipus Platypus hydration systems represent a whole new way of looking at hydration. At first glance, these Platypus water bottles and Platypus reservoirs appear unconventional; on closer examination you'll discover there's a lot to like. Platypus hydration bottles and reservoirs are so flexible they fit into tight spaces in any pack. The Platipus® Percussion Driven Earth Anchor (PDEA®) is a unique, modern and versatile device that can be rapidly deployed in most displaceable ground conditions. It offers a lightweight corrosion resistant ground anchor that can be driven from surface level using conventional portable equipment. The platypus (Ornithorhynchus anatinus), sometimes referred to as the duck-billed platypus, is a semiaquatic egg-laying mammal endemic to eastern Australia, including Tasmania. The platypus is the sole living representative of its family (Ornithorhynchidae) and genus (Ornithorhynchus), though a number of related species appear in the fossil record. The Platipus® Percussion Driven Earth Anchor (PDEA®) is a unique, modern and versatile device that can be rapidly deployed in most displaceable ground conditions. It offers a lightweight corrosion resistant anchor that can be driven from ground level using conventional portable equipment. Platypus bills give them a “sixth sense.” A platypus’s bill has thousands of cells that give it a sort of sixth sense, allowing them to detect the electric fields generated by all living things.
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Shaw even took a pair of scissors to the dried skin to check for stitches. There is no universally-agreed plural form of "platypus" in the English language.

Scientists generally use "platypuses" or simply "platypus". Colloquially, the term "platypi" is also used for the plural, although this is a form of pseudo-Latin ; [6] going by the word's Greek roots the plural would be "platypodes".

Early British settlers called it by many names, such as "watermole", "duckbill", and "duckmole".

In David Collins 's account of the new colony —, he describes coming across "an amphibious animal, of the mole species". His account includes a drawing of the animal.

The body and the broad, flat tail of the platypus are covered with dense, brown, biofluorescent fur that traps a layer of insulating air to keep the animal warm.

The webbing on the feet is more significant on the front feet and is folded back when walking on land. The elongated snout and lower jaw are covered in soft skin, forming the bill.

The nostrils are located on the dorsal surface of the snout, while the eyes and ears are located in a groove set just back from it; this groove is closed when swimming.

Weight varies considerably from 0. This pattern does not seem to follow any particular climatic rule and may be due to other environmental factors, such as predation and human encroachment.

Modern platypus young have three teeth in each of the maxillae one premolar and two molars and dentaries three molars , which they lose before or just after leaving the breeding burrow; [11] adults have heavily keratinised pads in their place.

However, the external opening of the ear still lies at the base of the jaw. While both male and female platypuses are born with ankle spurs, only the spurs on the male's back ankles deliver venom, [25] [26] [27] composed largely of defensin -like proteins DLPs , three of which are unique to the platypus.

The function of defensins is to cause lysis in pathogenic bacteria and viruses, but in platypuses they also are formed into venom for defence.

Although powerful enough to kill smaller animals such as dogs, the venom is not lethal to humans, but the pain is so excruciating that the victim may be incapacitated.

Information obtained from case histories and anecdotal evidence indicates the pain develops into a long-lasting hyperalgesia a heightened sensitivity to pain that persists for days or even months.

The female platypus, in common with echidnas, has rudimentary spur buds that do not develop dropping off before the end of their first year and lack functional crural glands.

The venom appears to have a different function from those produced by non-mammalian species; its effects are not life-threatening to humans, but nevertheless powerful enough to seriously impair the victim.

Since only males produce venom and production rises during the breeding season, it may be used as an offensive weapon to assert dominance during this period.

Similar spurs are found on many archaic mammal groups, indicating that this is an ancient characteristic for mammals as a whole, and not exclusive to the platypus or other monotremes.

Monotremes are the only mammals apart from at least one species of dolphin [33] known to have a sense of electroreception : they locate their prey in part by detecting electric fields generated by muscular contractions.

The platypus's electroreception is the most sensitive of any monotreme. The electroreceptors are located in rostrocaudal rows in the skin of the bill, while mechanoreceptors which detect touch are uniformly distributed across the bill.

The electrosensory area of the cerebral cortex is contained within the tactile somatosensory area, and some cortical cells receive input from both electroreceptors and mechanoreceptors, suggesting a close association between the tactile and electric senses.

Both electroreceptors and mechanoreceptors in the bill dominate the somatotopic map of the platypus brain, in the same way human hands dominate the Penfield homunculus map.

The platypus can determine the direction of an electric source, perhaps by comparing differences in signal strength across the sheet of electroreceptors.

This would explain the characteristic side-to-side motion of the animal's head while hunting. The cortical convergence of electrosensory and tactile inputs suggests a mechanism that determines the distance of prey that, when they move, emit both electrical signals and mechanical pressure pulses.

The platypus uses the difference between arrival times of the two signals to sense distance. Feeding by neither sight nor smell, [38] the platypus closes its eyes, ears, and nose each time it dives.

Monotreme electrolocation probably evolved in order to allow the animals to forage in murky waters, and may be tied to their tooth loss.

In recent studies it has been suggested that the eyes of the platypus are more similar to those of Pacific hagfish or Northern Hemisphere lampreys than to those of most tetrapods.

The eyes also contain double cones , which most mammals do not have. Although the platypus's eyes are small and not used under water, several features indicate that vision played an important role in its ancestors.

The corneal surface and the adjacent surface of the lens is flat while the posterior surface of the lens is steeply curved, similar to the eyes of other aquatic mammals such as otters and sea-lions.

A temporal ear side concentration of retinal ganglion cells , important for binocular vision, indicates a role in predation , while the accompanying visual acuity is insufficient for such activities.

Furthermore, this limited acuity is matched by a low cortical magnification , a small lateral geniculate nucleus and a large optic tectum , suggesting that the visual midbrain plays a more important role than the visual cortex , as in some rodents.

These features suggest that the platypus has adapted to an aquatic and nocturnal lifestyle, developing its electrosensory system at the cost of its visual system; an evolutionary process paralleled by the small number of electroreceptors in the short-beaked echidna , which dwells in dry environments, whilst the long-beaked echidna , which lives in moist environments, is intermediate between the other two monotremes.

In , research in biofluorescence revealed the platypus is one of the monotremes that glow when exposed to black light in a bluish-green colour.

The platypus is semiaquatic, inhabiting small streams and rivers over an extensive range from the cold highlands of Tasmania and the Australian Alps to the tropical rainforests of coastal Queensland as far north as the base of the Cape York Peninsula.

Inland, its distribution is not well known. It was considered extinct on the South Australian mainland, with the last sighting recorded at Renmark in , [45] until some years after John Wamsley had created Warrawong Sanctuary see below in the s, setting a platypus breeding program there, and it had subsequently closed.

However, with the SA Department for Environment and Water recovery teams working hard to reinstate their habitat, there had been a number of sightings reported by April The platypus is no longer found in the main part of the Murray-Darling Basin , possibly due to the declining water quality brought about by extensive land clearing and irrigation schemes.

In captivity, platypuses have survived to 17 years of age, and wild specimens have been recaptured when 11 years old. Mortality rates for adults in the wild appear to be low.

Low platypus numbers in northern Australia are possibly due to predation by crocodiles. The platypus is an excellent swimmer and spends much of its time in the water foraging for food.

It has a very characteristic swimming style and no external ears. Dives normally last around 30 seconds, but can last longer, although few exceed the estimated aerobic limit of 40 seconds.

Recovery at the surface between dives commonly takes from 10 to 20 seconds. When not in the water, the platypus retires to a short, straight resting burrow of oval cross-section, nearly always in the riverbank not far above water level, and often hidden under a protective tangle of roots.

The average sleep time of a platypus is said to be as long as 14 hours per day, possibly because it eats crustaceans , which provide a high level of calories.

The platypus is a carnivore : it feeds on annelid worms, insect larvae , freshwater shrimp , and freshwater yabby crayfish that it digs out of the riverbed with its snout or catches while swimming.

It uses cheek-pouches to carry prey to the surface, where it is eaten. When the platypus was first encountered by European naturalists , they were divided over whether the female lays eggs.

She does, finally confirmed by William Hay Caldwell 's team in The species exhibits a single breeding season ; mating occurs between June and October, with some local variation taking place between different populations across its range.

The female softens the ground in the burrow with dead, folded, wet leaves, and she fills the nest at the end of the tunnel with fallen leaves and reeds for bedding material.

This material is dragged to the nest by tucking it underneath her curled tail. We do not encourage or condone the use of this program if it is in violation of these laws.

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Generally most active around dawn and dusk crepuscular , platypuses can also be active during the day depending on the season, cloud cover, stream productivity, and even individual preference.

Platypuses are not known to hibernate. Platypuses range in length from 38 to 60 cm 15 to 24 inches ; males are generally larger than females.

Aquatic adaptations include the flat streamlined body, dorsally placed eyes and nostrils, and dense waterproof fur that keeps the platypus well insulated.

Long guard hairs protect the soft underfur, which remains dry even after hours in the water. The extensive webbing on the front feet extends well past the claws and is essential in propelling the animal through the water.

The paddlelike tail acts as a stabilizer during swimming, while the back feet act as rudders and brakes. Odd skeletal features of platypuses include an archaic robust shoulder girdle and a short, wide humerus providing extensive muscle attachment areas for the exceptionally strong front limbs.

The outside of the bill is covered by soft, sensitive skin. Inside the bill, adult platypuses do not have true teeth but instead have developed flat pads of hardened gum tissue.

Bisa ini mampu membunuh anjing dan haiwan peliharaan lebih kecil. Bisa Platypus dihasilkan pada kelenjar krural pada Platipus jantan ketika musim mengawan dan digunakan dengan ganas menerusi taji "calcaneous" pada setiap kaki belakang "hindlimb".

Kerana bisa tersebut mempunyai fungsi berbeza berbanding bisa yang dihasilkan spesies bukan mamalia, ia mungkin mengandungi peptide atau molekul yang kesan utamanya tidak mengancam nyawa tetapi bagaimanapun melumpuhkan mangsa.

Buktinya dapat dilihat berdasarkan simptom "envenomation" platipus. Pada manusia simptom paling jelas adalah kesakitan yang amat dan segera.

Edema terbentuk dengan cepatnya sekitar luka dan beransur merebak keseluruhan anggota tubuh. Maklumat yang diperolehi dari sejarah kes dan bukti anecdotal evidence menunjukkan kesakitan bertukar kepada hyperalgesia berpanjangan yang kekal selama beberapa hari atau bulan.

Platipus adalah nokturnal dan semi- akuatik , mendiami anak sungai dan sungai yang merangkumi kawasan yang luas dari tanah tinggi sejuk Tasmania dan the Australian Alps sehingga hutan hujan tropika persisiran pantai Queensland sejauh ke utara pangkal Semenanjung Cape York.

Di daratan, taburannya kurang diketahui: ia pupus di Selatan Australia tidak mengira populasi dilepaskan kembali di Pulau Kangaroo dan tidak lagi dijumpai di bahagian utama Murray-Darling Basin , kemungkinannya akibat kualiti air yang merosot akibat skim pembukaan tanah dan pengaliran yang pesat.

Sepanjang sistem sungai persisiran pantai, taburannya tidak dapat dijangka; ia kelihatannya tiada dari sebahagian sungai yang agak bersih, tetapi mengekalkan kehadiran di sungai yang agak tercemar sebagai contoh, hilir Maribyrnong.

Platipus adalah perenang handal dan menghabiskan banyak masa di dalam air. Ia menutup mata ketika berenang, dan bergantung kepada deria lain sepenuhnya.

Kesemua empat kaki Platipus bercantum seperti kaki itik. Apabila platipus berenang, ia meluncurkan diri dengan mengayuh dengan dua kaki hadapan.

Ekor dan kaki belakang membantu pengemudian tetapi tidak bagi tujuan tujahan. Platipus ialah haiwan maging. Platipus makan cacing dan larva serangga , udang air tawar , dan yabbie crayfish air tawar yang digalinya dari dasar sungai dengan paruhnya atau tangkap ketika berenang.

Paruhnya amat sensitif, membenarkannya memburu makanan tanpa melihat. Platipus adalah salah satu dari sebahagian kecil mamalia yang diketahui mempunyai deria electroception : ia mengesan mangsa sebahagiannya dengan mengesan arus eletrik badan mereka.

Platypus reproduction is nearly unique. It is one of only two mammals the echidna is the other that lay eggs. Females seal themselves inside one of the burrow's chambers to lay their eggs.

A mother typically produces one or two eggs and keeps them warm by holding them between her body and her tail. The eggs hatch in about ten days, but platypus infants are the size of lima beans and totally helpless.


3 Kommentare

Moogulkree · 13.09.2020 um 08:25

Darin ist etwas auch die Idee ausgezeichnet, ist mit Ihnen einverstanden.

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