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T.Rex Couldn't Run?!
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Topic Started: Jul 31 2017, 02:04 PM (1,341 Views)
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Troy Troodon
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Jul 31 2017, 02:04 PM
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This and This.
I don't know if it deserves it's own topic but, what do you make of this?!
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kusanagi
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Jul 31 2017, 02:48 PM
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Tyrannosaurus limbs were birdlike but the crural index suggests T. was not a habitual runner. Other large predators like the abelisaurids and so on weren't either but nor were some small coelurosaurs like Ornitholestes. Coelophysoids were but it can't be assumed all theropods were cursorial without assuming they are paraphyletic. Some maniraptors and tyrannosauroids were but others weren't. Compsognathids, alvarezsaurs and ornithomimosaurs all were.
Edited by kusanagi, Jul 31 2017, 02:49 PM.
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Troy Troodon
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Jul 31 2017, 02:54 PM
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- kusanagi
- Jul 31 2017, 02:48 PM
Tyrannosaurus limbs were birdlike but the crural index suggests T. was not a habitual runner. Other large predators like the abelisaurids and so on weren't either but nor were some small coelurosaurs like Ornitholestes. Coelophysoids were but it can't be assumed all theropods were cursorial without assuming they are paraphyletic. Some maniraptors and tyrannosauroids were but others weren't. Compsognathids, alvarezsaurs and ornithomimosaurs all were. So in a layman's words...
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kusanagi
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Jul 31 2017, 03:01 PM
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- Troy Troodon
- Jul 31 2017, 02:54 PM
- kusanagi
- Jul 31 2017, 02:48 PM
Tyrannosaurus limbs were birdlike but the crural index suggests T. was not a habitual runner. Other large predators like the abelisaurids and so on weren't either but nor were some small coelurosaurs like Ornitholestes. Coelophysoids were but it can't be assumed all theropods were cursorial without assuming they are paraphyletic. Some maniraptors and tyrannosauroids were but others weren't. Compsognathids, alvarezsaurs and ornithomimosaurs all were.
So in a layman's words... Only a few specialised clades of dinosaurs were habitually cursorial and big tyrannosaurs were ambush predators like the rest of the "carnosaur" morphotype.
Edited by kusanagi, Jul 31 2017, 03:02 PM.
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IIGSY
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Jul 31 2017, 03:05 PM
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Dinosaurs sure have changed a lot since they where since discovered.
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Jul 31 2017, 03:54 PM
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I presume this only reiterates that tyrannosaurus was specialised to hunting ceratopsians, ankylosaurids and other slower-moving prey, rather then hadrosaurs and ornithomimids, who presumably would be preyed on by dromaeosaurs and crocodilians (full-grown specimens of the former may even have had no predators).
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IIGSY
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Jul 31 2017, 03:58 PM
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- Yiqi15
- Jul 31 2017, 03:54 PM
I presume this only reiterates that tyrannosaurus was specialised to hunting ceratopsians, ankylosaurids and other slower-moving prey, rather then hadrosaurs and ornithomimids, who presumably would be preyed on by dromaeosaurs and crocodilians (full-grown specimens of the former may even have had no predators). Tyrannosaurs may have specialized in slow moving armored prey, but didn't mean it couldn't opportunistically take other prey if it got the chance
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Projects Punga: A terraformed world with no vertebrates Last one crawling: The last arthropod
ARTH-6810: A world without vertebrates (It's ded, but you can still read I guess)
Potential ideas- Swamp world: A world covered in lakes, with the largest being caspian sized. Nematozoic: After a mass extinction of ultimate proportions, a single species of nematode is the only surviving animal. Tri-devonian: A devonian like ecosystem with holocene species on three different continents.
Quotes "Arthropod respiratory systems aren't really "inefficient", they're just better suited to their body size. It would be quite inefficient for a tiny creature that can easily get all the oxygen it needs through passive diffusion to have a respiratory system that wastes energy on muscles that pump air into sacs. (Hence why lungless salamanders, uniquely miniscule and hyperabundant tetrapods, have ditched their lungs in favor of breathing with their skin and buccal mucous membranes.) But large, active insects already use muscles to pump air in and out of their spiracles, and I don't see why their tracheae couldn't develop pseudo- lungs if other conditions pressured them to grow larger."-HangingTheif
"Considering the lifespans of modern non- insect arthropods (decade-old old millipedes, 50 year old tarantulas, 100+ year old lobsters) I wouldn't be surprised if Arthropleura had a lifespan exceeding that of a large testudine"-HangingTheif
"Humans have a tribal mindset and it's not alien for tribes to war on each other. I mean, look at the atrocities chimpanzee tribes do to each other. Most of people's groupings and big conflicts in history are directly or obliquely manifestations of this tribal mindset."-Sceynyos-yis
"He's the leader of the bunch You know his Coconut Gun is finally back to fire in spurts. His Coconut Gun Can make you smile If he shoots ya it's firing in spurts. His Coconut Gun Is bigger, faster, stronger too! He's the gun member of the Coconut Crew! HUH!
C.G.! Coconut Gun! C.G.! Co-Coconut Gun! Shoot yourself with a Coconut Gun! HUH!"-Kamineigh
"RIP, rest in Peytoia."-Little
"In Summary: Piss on Lovecraft's racist grave by making lewds of Cthulhu and Nyarlathotep.
Then eat arby's and embrace the void."-Kamineigh
"Dougal Dixon rule 34."-Sayornis
Phylogeny of the arthropods and some related groups
In honor of the greatest clade of all time
More pictures
Other cool things
All African countries can fit into Brazil
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Troy Troodon
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Jul 31 2017, 04:01 PM
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- Jul 31 2017, 03:54 PM
I presume this only reiterates that tyrannosaurus was specialised to hunting ceratopsians, ankylosaurids and other slower-moving prey, rather then hadrosaurs and ornithomimids, who presumably would be preyed on by dromaeosaurs and crocodilians (full-grown specimens of the former may even have had no predators). And unless we're talking about a reasonably numbered pack of Dakotraptors, or the really big crocodilians like Deinosuchus, I'm fairly certain hadrosaurs were more of T.rex's mainstay prey, though how it could catch them is head scratching if indeed T.rex could not run at all.
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LittleLazyLass
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Jul 31 2017, 04:02 PM
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Troy Troodon
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Jul 31 2017, 04:06 PM
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- Jul 31 2017, 04:02 PM
Didn't I already address this in the SWHTYT thread? I honestly don't recall.
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ÐK
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Jul 31 2017, 04:10 PM
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Full grown Tyrannosaurus not being able to run is hardly anything new or surprising, as some of the articles have iterated, John Hutchinson produced similar results years ago and palaeontologists have been in general agreement over that ever since. These new studies only further corroborate this, except for some reason it's getting treated as if they're saying T. rex were slow.
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Yiqi15
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Jul 31 2017, 04:12 PM
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OK, I was thinking about the theory that Daspletosaurus and Gorgosaurus preyed on different types of dinosaurs to avoid competition among one another.
- Troy Troodon
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or the really big crocodilians like Deinosuchus I meant Deinosuchus when I said crocodilians.
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I'm fairly certain hadrosaurs were more of T.rex's mainstay prey, though how it could catch them is head scratching if indeed T.rex could not run at all. Presumably by ambush tactics.
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Troy Troodon
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Jul 31 2017, 04:19 PM
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Full grown Tyrannosaurus not being able to run is hardly anything new or surprising, as some of the articles have iterated, John Hutchinson produced similar results years ago and palaeontologists have been in general agreement over that ever since. These new studies only further corroborate this, except for some reason it's getting treated as if they're saying T. rex were slow. Well, weren't they?! I mean 12mph isn't exactly fast.
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TAXESbutNano
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Jul 31 2017, 04:23 PM
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Perhaps instead of chasing, they were nocturnal ambushers- approaching sleeping dinosaurs under the cover of dark and then grabbing them, much like how great white sharks might hunt tuna or how greenland sharks hunt seals.
Edit: Or, alternately, it just rapidly walked. Elephants don't seem to have much issue with reaching high speeds like that.
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Troy Troodon
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Jul 31 2017, 04:25 PM
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- Jul 31 2017, 04:23 PM
Perhaps instead of chasing, they were nocturnal ambushers- approaching sleeping dinosaurs under the cover of dark and then grabbing them, much like how great white sharks might hunt tuna or how greenland sharks hunt seals. Nocturnal Rexes; ones that hunt their prey in their sleep... huh, interesting.
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