Wager Mage
Wager Mage
Photo: Mathias Reding
Kangaroos and wallabies have remarkable reproductive plumbing: three vaginas and two separate uteri, both complete with their own ovaries, oviducts, and cervices.
Straddling could be a profitable move if you have several opponents that are prone to calling loose preflop, then folding to aggression postflop....
Read More »
If the odds have a plus, that means you'll win that amount of money if you win the wager. For example, let's say the odds are -150. This means...
Read More »For the swamp wallaby, mothering is a full-time business. While every other mammal on Earth gets a break between pregnancies, this particular species of Australian marsupial (Wallabia bicolor) is the only one to continuously have a bun in the oven. Sometimes, they even have two. Before an expectant wallaby gives birth, her body is already preparing for another joey. Just a few days before the due date, these remarkable creatures will copulate again, a new study reveals. The new embryo is conceived in another, separate uterus, while still carrying a full-term foetus in the first. "Conceiving during an active pregnancy is very tricky business," marsupial scientist Brandon Menzies told ScienceAlert, "which is why very few mammals to date have attempted this reproductive strategy." After all, looking after one joey is tiring enough. And male semen could contain dangerous foreign material that might put that first pregnancy at risk. Then, of course, there's the matter of sheer space. Kangaroos and wallabies have remarkable reproductive plumbing: three vaginas and two separate uteri, both complete with their own ovaries, oviducts, and cervices. Similar to other macropods, like kangaroos, swamp wallaby joeys are born immature and incomplete, which means they need extra time in the pouch to feed and grow up a little. But unlike a kangaroo, swamp wallaby ovulation time is shorter than their pregnancy length. As researchers have now discovered, this means these animals can conceive another life while still actively pregnant, alternating between two distinct uteri that operate in isolation from one another, including their hormonal control. Granted, the overlap in pregnancies is only a few days. Once the newborn in the pouch begins suckling, this triggers signals that arrest the development of the other embryo, a concept known as diapause. This means the new life won't start growing again until the pouch is free, roughly nine months later. Still, between a joey in the pouch and one in the womb, this means adult female wallabies are virtually always pregnant and lactating. The ability to ovulate, mate, and conceive anew while still actively pregnant is a remarkable thing, and it's only been described once before in the European brown hare (Lepus europeaus). Three or four days before giving birth, this little creature is known to copulate again, forming a new pregnancy. The difference is, the brown hare has distinct breeding seasons, which means it gets a break.
Little do they know they're acting out an emotional attachment to the feeling of losing. Such gamblers typically do become, in the derogatory sense...
Read More »
Handicap betting is where one selection in an event is given a "handicap" to overcome in order to win. This is popular when strong favorites are...
Read More »The swamp wallaby is not so lucky, although Menzies admits it's not all bad. "While it sounds demanding on the female that she is permanently pregnant, for most of the time this tiny embryo is sitting in the uterus consuming almost no resources at all, and in fact I'm not sure the animal would even know it is pregnant." Before this research, it was known that wallabies had a shorter ovulation period than gestation period, but Menzies and colleagues are the first to get a look under the hood. Using high-resolution ultrasound and vaginal smears, the team tracked the pregnancy and mating of 10 female swamp wallabies, revealing that they ovulate and mate one or two days before giving birth, conceiving a new embryo during active pregnancy. All other female macropods have an oestrous cycle slightly longer than their pregnancy length, which means they can mate and conceive again within hours of giving birth. "It is not clear why the swamp wallaby ovulates and mates prepartum compared to all other macropodids," the authors write. "It is unlikely to be related to any gain in developmental time of the embryo (one to three days) because this 'benefit' would be lost when the embryo enters its lengthy period of diapause." Having developed in Australia's unique environment, marsupials continue to bring evolutionary surprises to the table. "Studying marsupials is important because given their long period of evolutionary isolation from [placental] mammals, they often find novel solutions or work-arounds to common problems," Menzies told ScienceAlert. "Our current research is another example of when a marsupial has defied the norms of what we think is possible in reproduction, by using what it has and doing things a little differently."
How To Make $20k Fast Online Freelancing. One realistic way you can get $20k fast is to sell your skills online as a freelancer. ... Job Hop....
Read More »
Ken Rosewall, Australian Open 1971 Having easily won the Australian Open in 1971 (his third victory in the competition, which, however, was only...
Read More »
These are the healthiest cultures and diets in the world The Mediterranean diet. The Mediterranean Diet has long been touted as one of the world's...
Read More »
World Cup on BBC: Channel & pundits The BBC will air 33 live matches across the 28-day tournament in Qatar, including the final. As always, they...
Read More »
Promotion
Promotion