Platypus Facts Multiples can be called Platypuses, platypodes, or platypi

THEY HAVE NO STOMACH. They’re not the only ones to forgo an acid-producing part of the gut. Platypuses, spiny echidnas, and nearly a quarter of living fishes all have a gullet that connects directly to their intestines. These animals not only lost the physical feature of a stomach, but also the genes required to produce one over the millennia—meaning they’re unlikely to ever go back to having one.
THEY USED TO BE GIANT. This seems to be the case with a lot of modern animals—the ancient animals were oversized monster versions of what we have now. And platypuses are no different. In 2013, based on the discovery of a single tooth, researchers identified a prehistoric platypus that was over 3 feet long—double the size of the modern animal.
MONOTREME MEANS "SINGLE HOLE" IN GREEK. Platypuses are one of only five species of extant monotremes—just them and four species of echidna—which split from the rest of the mammals 166 million years ago. These egg-laying mammals get their name from the hole that serves as both anus and urino-genital opening. In 2008, scientists deciphered the entire DNA of the duck-billed platypus in a study involving more than 100 scientists from eight countries and found that, in accordance with the animal’s appearance, the platypus genome includes genes derived from the disparate worlds of reptiles, birds, and mammals.
THE MALES HAVE VENOMOUS SPURS. Platypuses are one of just a few venomous mammals—one of their more reptilian characteristics. But unlike snakes, a platypus’s venom isn’t in his teeth. Instead, males have a hollow spur on each hind leg from which venom is dispensed—but only sometimes. Although the spur itself sticks around, the venom gland to which it is connected is seasonally-activated and only produces venom during the mating season, indicating that its use is for fending off competing males.
THEY HAVE RETRACTABLE WEBBING. Although they can only stay submerged for a few minutes—they are mammals, after all—platypuses are much better suited to scooting around in water than they are on land. Much like an otter, they prune their thick coat to add air bubbles that act as insulation in the cool rivers where they hunt. Out on land, the short, splayed limbs of a platypus require it to exert 30 percent more energy to move around as compared to a terrestrial mammal of similar size. All that said, they do have one particular adaptation to ease their terrestrial travel. The webbing between their front claws—a boon when paddling through streams—retracts when the platypus ambles up the riverbank to expose sharp claws.
SCIENTISTS THOUGHT THE FIRST KNOWN PLATYPUS WAS A HOAX. Via Biodiversity Heritage Library When the first platypus specimen was sent back to England from Australia in the late 18th century, the scientists who examined it thought that someone was playing a trick on them. "It naturally excites the idea of some deceptive preparation by artificial means," English zoologist George Shaw wrote in the first scientific description of the platypus, published in 1799. That said, one of the most remarkable and weird aspects of the platypus—its ability to lay eggs—wasn’t discovered for another 100 years.
THEY USE GRAVEL AS MAKESHIFT TEETH ... Platypuses don’t have teeth inside their bill, which makes it difficult to chew some of their favorite foods—but they have worked out a pretty ingenious solution. Along with worms, insects, shellfish, and whatever else these bottom-feeders scoop up to make a meal out of, the platypus also picks up gravel from the riverbed. The platypus packs the whole lot into pouches in his cheek to carry it up to the surface where he munches away, using the bits of gravel as makeshift teeth to break up some of the tougher food.
... AND THEIR TAILS FOR ALL SORTS OF THINGS. Unlike beavers, which have very visually similar tails, platypuses don't use their tails to slap the water in warning, or even to propel them through the water. Most of the time, the primary function of the platypus tail is just to store up to half of the animal's body fat in case of a food shortage. The bristle-like fur on the upper side of the tail also makes it useful in pushing away dirt while digging a burrow or gathering leaves to make a nest. A female platypus also uses her tail to hold incubating eggs against her warm body.
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http://mentalfloss.com/article/63062/10-curious-and-quirky-platypus-facts http://phenomena.nationalgeographic.com/2013/12/03/how-the-platypus-and-a-quarter-of-fishes-lost-their-stomachs/ http://www.independent.co.uk/news/science/after-200-year-quest-scientists-finally-unravel-the-bizarre-origins-of-the-duck-billed-platypus-822812.html

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