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Post by brobear on Jul 1, 2021 6:51:41 GMT -5
www.sci-news.com/paleontology/end-cretaceous-dinosaur-biodiversity-09815.html Dinosaur Biodiversity Declined before Chicxulub Asteroid Impact: Study. The most famous mass extinction was the disappearance of non-avian dinosaurs at the end of the Cretaceous period, 66 million years ago, after ruling the Earth for 170 million years. The best-supported extinction model is the impact of a large asteroid at Chicxulub, Mexico. However, it is widely debated whether dinosaurs were in decline or not before the Chicxulub impact. A study in the journal Nature Communications provides new evidence for an environmentally-driven global decline across dinosaur groups well before the asteroid impact.
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Post by OldGreenGrolar on Jul 4, 2021 5:35:52 GMT -5
T rex vs her most dangerous prey.
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Post by OldGreenGrolar on Jul 4, 2021 5:36:31 GMT -5
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Post by OldGreenGrolar on Jul 4, 2021 5:38:29 GMT -5
Best colour for a t rex?
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Post by brobear on Jul 15, 2021 0:53:20 GMT -5
Giganotosaurus vs Tyrannosaurus:
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Post by brobear on Jul 16, 2021 14:14:45 GMT -5
www.nature.com/articles/s41598-017-02161-w?fbclid=IwAR1SagwdkM92xK27uuq0VPaYrG7mjRDkdrc7MthVVp71Bn91kv7195uXbtg The Biomechanics Behind Extreme Osteophagy in Tyrannosaurus rex. Most carnivorous mammals can pulverize skeletal elements by generating tooth pressures between occluding teeth that exceed cortical bone shear strength, thereby permitting access to marrow and phosphatic salts. Conversely, carnivorous reptiles have non-occluding dentitions that engender negligible bone damage during feeding. As a result, most reptilian predators can only consume bones in their entirety. Nevertheless, North American tyrannosaurids, including the giant (13 metres [m]) theropod dinosaur Tyrannosaurus rex stand out for habitually biting deeply into bones, pulverizing and digesting them. How this mammal-like capacity was possible, absent dental occlusion, is unknown. Here we analyzed T. rex feeding behaviour from trace evidence, estimated bite forces and tooth pressures, and studied tooth-bone contacts to provide the answer. We show that bone pulverization was made possible through a combination of: (1) prodigious bite forces (8,526–34,522 newtons [N]) and tooth pressures (718–2,974 megapascals [MPa]) promoting crack propagation in bones, (2) tooth form and dental arcade configurations that concentrated shear stresses, and (3) repetitive, localized biting. Collectively, these capacities and behaviors allowed T. rex to finely fragment bones and more fully exploit large dinosaur carcasses for sustenance relative to competing carnivores.
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Post by brobear on Jul 29, 2021 12:45:00 GMT -5
T-rex>spinosaur in coolness The real Spinosaurus aegyptiacus was a far cry from the popular Jurassic Park 3 movie monster. He was probably on the prey menu of Carcharodontosaurus saharicus. T-rex; much to coolest ( IMO ).
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Post by OldGreenGrolar on Aug 1, 2021 4:05:24 GMT -5
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Post by brobear on Aug 1, 2021 8:03:29 GMT -5
Interesting find OldGreenGrolar
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Post by OldGreenGrolar on Aug 1, 2021 19:00:33 GMT -5
Interesting find OldGreenGrolar Someone from another server showed me this account. I think it is similar to birds of prey, the more agile ones have greater reverse sexual demorphism than the slower but larger ones. From example, female sparrow hawks are twice as large as males but there is not much difference between male and female vultures, the white headed vulture being the best hunter among vultures have greater reverse sexual demorphism than the rest of their kind.
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Post by brobear on Aug 8, 2021 4:54:28 GMT -5
www.sciencefocus.com/nature/inside-the-mind-of-a-dinosaur-2/?fbclid=IwAR0G7LO8q48WcM-uwpIE7e6nc-dEzmfXo9C5X_DEez8g4V5NHRmuA57ldHE In fact, not only was T. rex roughly as intelligent as a chimp, but it had enormous olfactory bulbs that imparted a strong sense of smell, elongate and looping inner ear canals that coordinated rapid eye movements and quick reflexes, and an elongate cochlea that could hear low-frequency sounds. If a 13-metre-long, 7-tonne, bone-crunching predator wasn’t scary enough, its brainpower and sensory acumen ensured that T. rex was the biggest, baddest predator that ever lived. *Note; the 'Jurassic Park' idea of T-rex being unable to see his prey if it stood still was wrong. T-rex had excellent vision.
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Post by brobear on Aug 11, 2021 1:08:39 GMT -5
welovetrump.com/2021/08/07/mike-lindell-gives-massive-interview-with-greg-hunter-on-eve-of-cyber-symposium/?utm_source=newsletter_randy&utm_medium=mixed&utm_campaign=newsletter_randy&fbclid=IwAR2OFTF9-pOrp2UDVkkoOdPNyxSPoZRn6fQCyhwGOdZI_1X4xehzAhvAUDA If the tooth fairy visited T. rexes, they’d never have time for anyone else. All the teeth inside that mammoth dino cranium regrew every two years, so it was a constant cycle of losing their fangs. Constant tooth regeneration secured the T. rex's spot for the most powerful jaw of any creature in history. Their prey was crushed with the force of 7,800 lbs, which would be like having three Mini Coopers dropped on top of you. Experts debated whether the T. rex was only a hunter, or if they also dabbled in scavenging dead animals. It was determined that they ate their own based on fossilized waste examinations. Though the question remained, did they eat prey alive? Based on the evidence available so far, all signs point to T. rexes as strictly bloodthirsty carnivorous hunters, not scavengers. One mischaracterization that Steven Spielberg included in his film is that their eye position limited their sight to tracking only moving objects. That’s pure fabrication. With peepers the size of oranges, the T. rex could clock a meal using its unparalleled depth perception, thanks to the large distance between its forward-facing eyes. If you found yourself face to face with a hungry T. rex, you could've outrun it — because they couldn’t run! Similar to the limbs of an elephant, the hind legs remained fairly straight with at least one limb keeping balance on the ground. At birth, paleontologists say the underdeveloped dinosaurs were capable of running but that decreased with growth. But the T. rex had no issue catching its food. It was a master speed walker, gliding along in lengthy strides of about 10 to 25 mph.
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Post by OldGreenGrolar on Aug 14, 2021 17:33:53 GMT -5
Reply 111. I am sure that a huge prehistoric croc would be a real threat.
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Post by brobear on Aug 15, 2021 0:41:19 GMT -5
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Post by OldGreenGrolar on Aug 15, 2021 2:39:03 GMT -5
/\ Which one will win face to face in your opinion?
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Post by brobear on Aug 15, 2021 2:48:37 GMT -5
/\ Which one will win face to face in your opinion? They are roughly the same size, although the crocodile probably had some weight advantage. On dry land, I believe that being bipedal would give T-rex an edge due to maneuverability. In water, the croc has a huge advantage. For a fair face-off ( IMO ), a fight in water roughly six-feet deep, I would wager on T-rex ( although I wouldn't bet too much ).
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Post by OldGreenGrolar on Aug 17, 2021 19:11:23 GMT -5
I suggest making some dinosaur match ups if you like 😉.
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Post by brobear on Aug 18, 2021 0:26:14 GMT -5
I suggest making some dinosaur match ups if you like 😉. Well, we have to keep in mind that this is the 'Domain of the Bears'. I had decided to make this T-rex topic as I view him as being ( in a sense ) the brown bear of the dinosaurs.
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Post by brobear on Aug 18, 2021 1:53:33 GMT -5
*Movies which featured T-rex as the star or main villain: 1- The Lost World - 1925. 2- King Kong - 1933 ( not the star but a major antagonist ). 3- The Beast of Hollow Mountain - 1956. 4- Dinosaurus - 1960. 5- The Valley of Gwangi - 1969. 6- The Last Dinosaur - 1977. 7- Jurassic Park - 1993. 8- The Lost World: Jurassic Park - 1997.
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Post by brobear on Aug 24, 2021 3:40:05 GMT -5
www.sci-news.com/paleontology/tyrannosaurus-rexs-jaw-tactile-sensor-09986.html Tyrannosaurus rex’s Jaw Tip May Have Played Essential Role as Sensitive Tactile Sensor. “Tyrannosaurus rex was an even more fearsome predator than previously believed,” said Dr. Soichiro Kawabe, a paleontologist in the Institute of Dinosaur Research at Fukui Prefectural University. “Our findings show the nerves in the mandible of Tyrannosaurus rex is more complexly distributed than those of any other dinosaurs studied to date, and comparable to those of modern-day crocodiles and tactile-foraging birds, which have extremely keen senses.” “What this means is that Tyrannosaurus rex was sensitive to slight differences in material and movement,” he added. “It indicates the possibility that it was able to recognize the different parts of their prey and eat them differently depending on the situation.” “This completely changes our perception of Tyrannosaurus rex as a dinosaur that was insensitive around its mouth, putting everything and anything in biting at anything and everything including bones.”
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