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| Extinct Animal Questions | |
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| Topic Started: Nov 26 2013, 10:24 PM (193,384 Views) | |
| Tyranachu | Jul 17 2015, 12:36 AM Post #1651 |
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Nerdasaurus
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I read somewhere that tyrannosaurids had quite a dry mouth, so there wouldn't be enough moisture for the bacteria needed for a septic bite to grow. I just could not remember where I read that.
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| BossMan, Jake | Jul 17 2015, 01:40 AM Post #1652 |
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Son of God
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Well if you think about it all theropods would have had a nasty bite. Regardless of species meat will get stuck in a predator's mouth. So in by doing so it creates bacteria, one animal could have a more lethal dose than another depending on what/and how much it has eaten. |
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Jul 17 2015, 01:57 AM Post #1653 |
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Meat gets stuck in the teeth of carnivorous mammals as well yet they don't have septic bites, the bacteria on an infected bite would usually come from the outside environment. The same for crocodiles. |
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| Tyranachu | Jul 17 2015, 02:26 AM Post #1654 |
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Nerdasaurus
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Exactly. Even reptiles with rather wet mouths, like Komodo dragons, don't have a septic bite nearly as lethal as you say. The infections buffalo get after getting bitten by a dragon is usually caused by the crap-filled cesspools they love to wallow in, not the dragon's saliva. |
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| Incinerox | Jul 17 2015, 07:37 AM Post #1655 |
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Āeksiot Zaldrīzoti
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As of two studies (2005 and 2009), turns out most squamates had some degree of venom in their bite (of varying potency, most not actually all that useful). People bitten by monitors have similar symptoms (rapid swelling, localized disruption of blood clotting, and shooting pain up to the elbow, with some symptoms lasting for several hours). So you'd be half right. Infections would be caused by the cesspools buffalo wallow in. But there was more in play than just infections. Regardless, comparing a komodo dragon's bite with that of T. rex is inaccurate anyway. With a set of bone breaking jaws like that, T. rex wasn't lacerating and waiting around for prey to die. It was making a quick, clean kill. Allosaurus on the other hand WAS lacerating prey. But there is absolutely ZERO indication that it was relying on venom and/or infections to finish off whatever it was trying to kill. |
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| Paleop | Jul 19 2015, 11:12 PM Post #1656 |
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Paleopterix
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out of curiosity, what's the chance that a charcharadontosaur species surviving into the late maastrichian? |
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| Komodo | Jul 20 2015, 09:58 AM Post #1657 |
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Varanus komodoensis
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I think it wasn't very high. At the early stages of the Late Cretaceous there was a extinction event where some groups and families like Spinosaurids in land, and Ichthyosaurs (possibly) and pliosaurs in water became extinct. Some consider the extinction was caused by underground volcanic activity that brought a global warming that modified the environments of these animals. The accumulation of carbon dioxid in the oceans, for example, killed off a lot of invertebrate families. In the case of Carcharodontosaurids, after their habitat changed, they likely became decimated, as all the largest, dominant ones became extinct. There are some late Campanian-early Maastrichtian South American records (mandible fragments and teeth) that might belong to carcharodontosaurids, so there is a chance they survived til the earliest moments of the Maastrichtian. After the extinction event there was a huge global species replacement. In water, pliosaurs died, but the rest of plesiosaurs survived. The pliosaurs were eventually replaced as water superpredators by the Mosasaurs. Same thing happened on land: the Carnosauria and Spinosaurids were replaced by abelisaurs and tyrannosaurs. There are several causes why carcharodontosaurs were replaced: their prefered prey began to diminish, they couldn't get used to capture the new dominant herbivores or they had direct competence of more efficient and evolutioned carnivores that eventually pushed the carcharodontosaurs off their range, eventually they survived only in reduced areas til the Late Cretaceous. Edited by Komodo, Jul 20 2015, 10:01 AM.
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| Ulquiorra | Jul 20 2015, 10:02 AM Post #1658 |
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If Yi is now the shortest dinosaur genus name, then whats the longest genus name? |
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| Komodo | Jul 20 2015, 10:08 AM Post #1659 |
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Varanus komodoensis
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I think the record is still held by Micropachycephalosaurus hongtuyanensis. |
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| Even | Jul 20 2015, 10:54 AM Post #1660 |
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I still think that it's possible that at least 2-3 species of carcharodontosaurs survived by the late Maastrichtian, due to the fact that there are still sauropods in South America, and the breadth of land involved (especially if counting also the contiguous landmasses of Antarctica and Australia).. We also hadn't known anything about Africa yet.. |
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| Acinonyx Jubatus | Jul 20 2015, 12:50 PM Post #1661 |
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I AM THE UNSHRINKWRAPPER!
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What was the environment like in South Africa during the mid to late Permian? I know it was in the middle of an ice age, but I'm not sure about much else. |
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| Joe99 | Jul 21 2015, 01:00 AM Post #1662 |
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is A.fragillimus back and if so is it still 58 m long |
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| Furka | Jul 21 2015, 05:39 AM Post #1663 |
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Unlikely, since we lost the original bones. And I'm not sure but i heard somewhere that it was reclassified as a Diplodocus species. |
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| Incinerox | Jul 21 2015, 08:12 AM Post #1664 |
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Āeksiot Zaldrīzoti
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Seasonally arid is as detailed as I can come up with. Oh, there were also lots of these: https://en.wikipedia.org/wiki/Braided_river Which tells a bit about what kind of landscape you'd be dealing with. No word on flora though. Edited by Incinerox, Jul 21 2015, 08:18 AM.
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| MightyFan217 | Jul 21 2015, 09:06 AM Post #1665 |
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OH YESSS!
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So in regards to behavior and interspecies interactions, we all know it's famous for Tyrannosaurus rex and Triceratops to be eternal enemies to each other... but did this start because we had fossils to prove this for a long time? Or did this not start until Charles R. Knight made one of his most famous paintings of the two Dinosaurs in question? |
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