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Post by brobear on May 1, 2021 5:04:08 GMT -5
Juvenile Tyranosaurus probably hunted much more agile prey than their adult parents too. Some male leopards gain a bit of bulk when they get older (pass 5 years old) and target the slower and more dangerous warthog instead of the faster impalas. The juvenile T-rex had no predator competition in hunting medium-sized prey. And yes, they were quick and agile. As they grow older, they trade-off speed and agility for mass and muscle, and learn to hunt slower and often armored prey. Also, like the juveniles, the adult T-rex has no predator competition.
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Post by brobear on May 8, 2021 2:23:23 GMT -5
Night Stalker Rex Part I: Sue Is Built Like A Brickhouse antediluviansalad.blogspot.com/2016/09/night-stalker-rex-part-i-sue-is-built.html?fbclid=IwAR0oq0s_Th0QXxzqiF5kdR2SLwE9yYUj1QSGO_EPonJgjrUBXhW--LmMaPA Here it is folks - the king of all kings, the prize fighter of antiquity, the grand poobah, good ol' sexy rexy himself - as you have never imagined before. Ladies and gentleman I give you Night Stalker Rex. First of all time to talk about the elephant in the room when it comes to T. rex. And I literally mean elephant in the room. Sue not only was big, she was a certifiable fatty. Sue was not just a tad bit on the hefty side, she would have in life appeared ponderous and round to an almost cumbersome degree. When you really look at Sue - and to a lesser extent smaller adult rexes - once you get past the huge maw, lethal bananas, and overall size - you have to be impressed with that barrel chest. I mean come on now, if you take the perspective of the above photo and add on even just a smattering of integument, skin, muscle, and fat to the torso you quite literally would not see the hips from behind that thick barrel chest!! The real elephant in the room is not that T. rex had a massive barrel chest - that has been known and commented upon for some time - the issue is that no other terrestrial tetrapod predator has such a barrel chest!! You really have to go into the aquatic realm to find such girthy predators, animals that have escaped the burdens of gravity. It snuck up on dinosaurs both awake and asleep - although sleeping dinosaurs became more of a specialization in larger rexes - under cloak of darkness. Literally nothing was safe in the kingdom of rex - everything from armored ankylosaurids to speedy ornithomimids - could and did end up in the belly of the tyrant ruler king.
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Post by OldGreenGrolar on May 8, 2021 3:07:20 GMT -5
Few animals are safe from a T. rex.
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Post by brobear on May 8, 2021 14:48:30 GMT -5
Tyrannosauroidea Bitey bitey, bitey. Who has a strongest bite? Dunkleosteus, Carcharodon (Great White Shark) and Tyrannosaurus. - This is one of the several illustrations in the Dunkleosteus book of the “Extinct” series that I illustrated and are wonderfully written by Professor Ben Garrod. This and the other first two books of the series are available next week in the UK!
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Post by OldGreenGrolar on May 9, 2021 5:08:59 GMT -5
The shark has the best slicing bite out of the three above.
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Post by brobear on May 9, 2021 5:30:24 GMT -5
The shark has the best slicing bite out of the three above. Dunkleosteus doesn't actually have teeth. His bite is basically like a guillotine.
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Post by brobear on May 10, 2021 5:13:21 GMT -5
Tyrannosauroidea Growing up fast According to histological and morphometric analyses, researchers can more or less estimate the growth rate of extinct fossil groups. For example, non-avian dinosaurs (generally varying slightly between taxons) grow faster than modern reptiles and early birds, but less accelerated compared to marsupial mammals and altricial birds .... Such a condition may indicate an intermediate degree, going high in parental care, as in examples that develop faster above, there is greater parent s' dedication to pups for longer. Sort of like this: - a bug that has rapid development in the embryonic phase, is born very large and capable of surviving practically on its own. However, this one won't have parental care and grow much slower in the neonate / puppy phase. - a bug that has slow development in the embryonic phase, is born small and fragile. You will have greater parental investment, getting lots of energy and growing fast. It is possible that many dinos, including theropods would be more biased in the second case. Mom rex wasn't a tyrant, she was careful! On the chart, growth rates regression line x body size. Source: BRUSATTE, S.L. 2012. Dinosaur Paleobiology. Wiley-Blackwell. 349p
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Post by OldGreenGrolar on May 11, 2021 11:12:53 GMT -5
Some are more lightly built than the others just by looking at these pictures. The moros is a small version of the T. rex.
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Post by brobear on May 12, 2021 0:20:49 GMT -5
Some are more lightly built than the others just by looking at these pictures. The moros is a small version of the T. rex. The Tyrannosaurs began as small theropods ( Coelurosauria ) and, as time passed, evolved into the greatest land-based predators to ever walk the Earth. As can be seen in the first picture on Reply #75, the juvenile T-rex acts as his ancestors did, a speedy chase-and-catch predator.
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Post by brobear on May 13, 2021 15:26:14 GMT -5
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Post by OldGreenGrolar on May 13, 2021 16:09:19 GMT -5
I have been to some dinosaur exhibitions as a child. Wouldn’t mind seeing another T. rex skeleton.
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Post by brobear on May 27, 2021 13:05:11 GMT -5
Tyrannosauridae famliy My new Yutyrannus painting. My newest painting: A Yutyrannus walks through a snowstorm 125 million years ago in China. Inspired by the Beasts of the Mesozoic Tyrannosaurs Series Yutyrannus action figure by David Silva of Creative-Beast Studio, which is currently readying for Kickstarter campaign launch.- Jeremy Herz
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Post by brobear on Jun 2, 2021 12:38:58 GMT -5
www.sciencenewsforstudents.org/article/tyrannosaurus-rex-bite-force-jaw-fossil-dinosaur?fbclid=IwAR1qhFAWu878N3VQSxU06BdUXUWPj9xQ3x8a9nzDinu3SsOOVvMPknPEnsQ The secret to T. rex‘s incredible biting force is at last revealed. A small bone stiffened its lower jaw, bracing an otherwise flexible joint. The fearsome Tyrannosaurus rex had a tremendous bone-crushing bite. What made this possible was a stiff lower jaw. And that stiffness came from a boomerang-shaped bit of bone. A new study finds that this small bone braced what would have been an otherwise flexible lower jaw. Unlike mammals, reptiles and their close kin have a joint within their lower jawbone, or mandible. That lower jaw gives this joint its tongue-twister name — intramandibular (IN-truh-man-DIB-yu-lur) joint. Many scientists just call it the IMJ.
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Post by brobear on Jun 3, 2021 0:23:09 GMT -5
www.sciencedaily.com/releases/2021/06/210602091409.htm Young T. rexes had a powerful bite, capable of exerting one-sixth the force of an adult. Juvenile tyrannosaurs tested their chops as they grew to become bone crushers like their parents. Scientists have experimentally measured the bite force of adult T. rexes but not of younger tyrannosaurs. Fossils with juvenile bite marks have now allowed experts to experimentally test how hard juveniles could chomp. Though their bite force is one-sixth that of an adult, it is still stronger than that of living hyenas. The measurement is higher than previous estimates, suggesting a different ecological niche for these youngsters.
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Post by OldGreenGrolar on Jun 4, 2021 8:42:54 GMT -5
The moros is the smallest member of the tyranosaurus family.
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Post by OldGreenGrolar on Jun 4, 2021 8:44:01 GMT -5
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Post by brobear on Jun 18, 2021 5:13:47 GMT -5
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Post by OldGreenGrolar on Jun 19, 2021 10:44:20 GMT -5
/\ The T. rex has the stronger and tougher skeleton. The gigantosaurus vs T. rex debate used to be popular until it is discovered that both their weights have not much difference. That is probably what closed the debate.
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Post by brobear on Jun 27, 2021 3:14:52 GMT -5
www.sciencenews.org/article/dinosaur-arctic-bone-fossil-alaska-paleontology?fbclid=IwAR3ou0pKoUK5wkatlnkkiz1BCtWcJrOMssB-TG7hvF-dzoi3yAwQ1YGKNyA For some dinosaurs, the Arctic may have been a great place to raise a family. Fossil baby teeth and bones hint that some dinosaurs reared their young near the North Pole. Dinosaurs didn’t just summer in the high Arctic; they may have lived there year-round, new fossil evidence suggests. Hundreds of bones and teeth found along the Colville River in northern Alaska belonged to dinosaur hatchlings, researchers say. The remains, which fell from outcroppings of the Prince Creek Formation, represent seven dinosaur families including tyrannosaurs, duck-billed hadrosaurs and horned and frilled ceratopsids. “These are the northernmost [non-avian] dinosaurs that we know of,” says paleontologist Patrick Druckenmiller of the University of Alaska Museum of the North in Fairbanks. And now it’s clear they’re not just migrating into polar latitudes, he says. “They’re actually nesting and laying and incubating eggs … practically at the North Pole.” Some of these dinosaurs incubated their eggs for up to six months, previous evidence suggests (SN: 1/23/17). That would have left little time for any dinos nesting in the Arctic to migrate south before winter set in, Druckenmiller and colleagues report online June 24 in Current Biology. And any offspring would have struggled to make the long journey. The Arctic was slightly warmer during the dinos’ lifetime than it is today. Between around 80 million and 60 million years ago, the region had an average annual temperature of about 6˚ Celsius — similar to that of modern-day Ottawa — fossilized plants from the Prince Creek Formation indicate. Still, overwintering dinosaurs would have endured months of darkness, cold temperatures and even snowfall, Druckenmiller says. They may have fought the cold with insulating feathers or some degree of warm-bloodedness (SN: 4/4/12); SN: 6/13/14), and the herbivores may have hibernated or eaten rotten vegetation when fresh food diminished in the dark months, Druckenmiller speculates. Finding these baby dino fossils unearthed more questions than answers, he admits. “We’ve opened a whole can of worms.”
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Post by OldGreenGrolar on Jun 29, 2021 4:59:05 GMT -5
/\ One of the dinosaurs which resided in the Arctic was the nanqusaurus.
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