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I have returned!
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Post by Lmpkio on Jan 18, 2014 23:31:31 GMT
(This isn't so new, but I decided to put this up). Quoted from Huffingtonpost: 'Presenting this week at the Society of Vertebrate Paleontology's meeting in Los Angeles, California, palaeontologist Jack Horner of the Museum of the Rockies in Bozeman, Montana, revealed that when he cut open the fossilized bones of dinosaurs in the museum’s collection and studied the layers of bone within, he found signs in most specimens that the animals were still growing at the time of their death.' Read the rest at the link below: Adult Dinosaurs Were Still Growing When They Died, Fossils Suggest
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Post by es1001 on Jan 19, 2014 5:43:43 GMT
I do not doubt that many of the dinosaurs that we have discovered probably were not fully grown when discovered. However, we have found many Tyrannosaurus remains, and they have all consistently been the same size, not counting the Jane and Sue specimens. This leads me to believe that we have discovered the full size of Tyrannosaurus.
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"May the flames guide thee"
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Post by thesporerex on Jan 19, 2014 11:33:02 GMT
Well its already known that dinosaurs never stopped growing until they died and that sue is the only Tyrannosaur to exceed 28 years(according to a paper Tyrannosaurus stopped growing rappidly between ages 22-27) so I would count sue is the closest to an adult T. rex yet found.
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Thero
Genyodectes
Eagle
{"image":"https://66.media.tumblr.com/bec0264f6aea4d9a0137ba0694abea69/tumblr_mmae6u05vY1relrdqo1_1280.jpg","color":"000000"}
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Post by Theropod on Jan 20, 2014 2:06:02 GMT
I am very sure Tyrannosaurus would probably not even reach 10 tons, FMNH PR2081 is probably gonna be our largest T. rex for a long time.
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Quiz Time! What's the only genus of lizard that can shoot a jet of slime out of it's tail?
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Post by raptorx863 on Jan 21, 2014 19:11:05 GMT
Most Dinosaurs DO NOT grow throughout their entire lifespan. Very few animals do that, and it's very rare in reptiles. Turtles, lizards, most snakes, and all crocodilians experience something called determinant growth and stop growing at a certain age. All birds also stop growing at a certain size as well. Thus, we would expect that dinosaurs did to, and that's what the fossils so far suggest.
The only dinosaur known that does not seem to have determinant growth is the "prosauropod" Plateosaurus, which experiences a wide range of adult sizes and growth rates typical of animals with indeterminate growth. For the rest of the known dinosaurian growth rates, all seem to be experiencing a slow-down period or a set a set age where they stop growing, as expected for determinant growth. That includes T.rex, Apatosaurus, Maisaura, Allosaurus, Tenontosaurus, and the rest of the Dinosauria for that matter.
As for the reasons why T.rex specimens are still growing at these sizes, that's a simple answer. All were not skeletally mature. Indeed, most dinosaurs known are not known from skeletally mature specimens simply because most dinosaurs did not reach skeletal maturity. They had brief, heavily active lives in a brutal world and died young, not the relatively long lives of mammals which mostly thrive in stable environments.
Moreover, dinosaurs reproduced before they were fully grown. Thus, most dinosaurs did not need to reach their fully adult sizes because by the time they reached adult age, they had already done their job and had had numerous clutches, each with possibly as many as fifty eggs or more. They did not need to reach adult size or age to do so, they just needed to have a lot of teenage pregnancies and flood the environment with their offspring.
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May 14, 2019 10:55:54 GMT
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The AFK Reptile
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Post by Rebmund10 on Jan 30, 2014 9:28:42 GMT
Turtles are immortal.
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Feb 24, 2019 19:15:10 GMT
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Post by themechabaryonyx789 on Jan 30, 2014 15:48:13 GMT
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Post by ornitholestes on May 18, 2014 11:02:37 GMT
The vast majority of dinosaur specimens are not osteologically mature→. That doesn’t mean they didn’t stop/severely slow down growth at some time. In any case, larger specimens for T. rex are certainly possible, but there is no hard evidence. Also, T. rex is actually among the very few dinosaurs (only together with Hypacrosaurus and Saurornitholestes in the 14 taxa studied in Myhrvold 2013) that have preserved specimens close to skeletal maturity (in this case, FMNH PR 2081), so it certainly shouldn’t be the first taxon in which to speculate on such ocurrences.
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Post by themechabaryonyx789 on May 19, 2014 6:48:40 GMT
Yea, pretty much every dinosaur specimen could potentially have freak specimens
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Post by ornitholestes on May 19, 2014 17:57:47 GMT
That doesn’t necessarily mean freak specimens, not even in T. rex. It’s rather that there’s a big deal of preservational bias towards the opposite–mostly subadults, and even among the adults mostly specimens that aren’t even fully grown.
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Aladar (and if you are asking about species, I am not sure)
The killer whale (Orcinus orca)
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Post by Thalassophoneus on Jun 27, 2014 18:45:27 GMT
WRONG! TURRITOPSIS DOHRNII IS IMMORTAL! NEVER UNDERESTIMATE TURRITOPSIS DOHRNII!
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Aladar (and if you are asking about species, I am not sure)
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Post by Thalassophoneus on Jun 27, 2014 18:49:41 GMT
I have heard about a discovered T-Rex specimen named UCMP 137538 and it is believed to have been about 15 meters long. This isn't really sure but I kind of believe it. First of all I WANT to believe and second there are extreme cases of humans (for example being 120 years old or being 2,7 meters tall). Why wouldn't this be an extreme case of Tyrannosaurus Rex?
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{"image":"https://66.media.tumblr.com/bec0264f6aea4d9a0137ba0694abea69/tumblr_mmae6u05vY1relrdqo1_1280.jpg","color":"000000"}
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Post by Theropod on Jun 27, 2014 20:09:01 GMT
UCMP 137538 is only known from a phalanx, even Amphicoelias fragillimus is known from better remains. UCMP 137538 could've been no bigger than FMNH PR2081 for all we know, given how proportions vary considerably in those animals. Scaling the specimen from the toes doesn't yield precise results.
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Aladar (and if you are asking about species, I am not sure)
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Post by Thalassophoneus on Jun 27, 2014 21:01:19 GMT
Maybe. However still, the larger it gets the more fascinating it is!
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Post by Theropod on Jun 27, 2014 21:56:52 GMT
Yes, but sadly we lack too many remains to scale it, scaling from a phalanx only will not yield precise results, as I said earlier.
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