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T.rex Senses

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Rex Fan 684

MemberCompsognathusJul-28-2014 7:21 AM

So I've been doing some research(more than usual) about the senses of T.rex. What I found was amazing.

 

Time to get all technical and stuff...

 

Vision-

A study published by Kent Stevens of the University of Oregon concluded that Tyrannosaurus had keen vision. By applying modified perimetry to facial reconstructions of several dinosaurs including Tyrannosaurus, the study found that Tyrannosaurs had a binocular range of 55 degrees, surpassing that of modern hawks, and had 13 times the visual acuity of a human, thereby surpassing the visual acuity of an eagle which is only 3.6 times that of a person. This would have allowed Tyrannosaurs to discern objects as far as 6 km away, which is greater than the 1.6 km that a human can see.

Thomas Holtz Jr. would note that high depth perception of Tyrannosaurus may have been due to the prey it had to hunt; noting that it had to hunt horned dinosaurs such as Triceratops, armored dinosaurs such as Ankylosaurus and the duck billed dinosaurs may have had complex social behaviors. He would suggest that this made precision more crucial for Tyrannosaurus enabling it to, "get in, get that blow in and take it down." In contrast, Acrocanthosaurus had limited depth perception because they hunted large sauropods, which were relatively rare during the time of Tyrannosaurus

 

Smell-

Tyrannosaurus is notable for having very large olfactory bulbs and olfactory nerves relative to their brain size, the organs responsible for a heightened sense of smell. This suggest that the sense of smell was highly developed, and implying that tyrannosaurs could detect carcasses by scent alone across great distances. The sense of smell in tyrannosaurs may have been comparable to modern vultures, which use scent to track carcasses for scavenging. Research on the olfactory bulbs has shown that Tyrannosaurus rex had the most highly developed sense of smell of 21 sampled non-avian dinosaurs species.

 

Hearing-

Somewhat unusually among theropods, T. rex had very long cochlea of the ear. The length of the cochlea is often related to hearing acuity, or at least the importance of hearing in behavior, implying that hearing was a particularly important sense to tyrannosaurs. Specifically, data suggests thatTyrannosaurus rex heard best in the low-frequency range, and that low-frequency sounds were an important part of tyrannosaur behavior.

 

Intelligence-

A study by Grant R. Hurlburt, Ryan C. Ridgely and Lawrence Witmer would obtain estimates for Encephalization Quotients (EQs), based on reptiles (REQs) and based on birds (BEQs), as well estimates for the ratio of cerebrum to brain mass. The study would conclude that Tyrannosaurus had the relatively largest brain of all adult non-avian dinosaurs with the exception of certain small maniraptoriforms ( BambiraptorTroodon and Ornithomimus).

 

How about all that. T.rex had quite the array of senses and smarts. Just figured I'd share that with you all.

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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Hiphopananomus
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Pretty cool, thanks for sharing!

"Somewhere on this island is the greatest predator that ever lived. Second greatest predator must take him down."Roland Tembo"

"Jurassic park: The Lost World"

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Rex Fan 684
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Sure thing :)

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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JRR
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Considering all of that, Trex must of had a sort of disadvantage in other senses.

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Rex Fan 684
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Since the only other two senses are taste and touch, I don't know how big a deal that'd be.

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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JRR
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Imean rex must of had somesort of diadvantage against its pray, no predator is perfect

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Rex Fan 684
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Short arms maybe. Not the fastest dinosaur out there(not bad for it's size though. A 7-10 ton animal moving 15-25 miles per hour ain't bad).

 

Don't forget it's prey was tough. Horned ceratopsians, armored ankylosaurs, giant sauropods, fleet footed ornithomimids, and long tailed hadrosaurs.

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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JRR
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maybe, i think rex whas only succesfoul in hunting around 30% of the time

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Rex Fan 684
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Well if T.rex wasn't a good hunter, then what kept the herbivore populations in check? It was the only predaotr big enough and common enough to do it(raptors were too small and rare to make any real impact and Nanotyrannus may have been a young T.rex).

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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JRR
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Its like a savana, lions arent alwhays sucsesfoul, drougths, floods, and climate changes keep the hervibore population undercontroll

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Rex Fan 684
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Then why have predators?

 

Anyways, this wasn't about T.rex hunting. This was about it's amazing array of senses and intelligence.

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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Hiphopananomus
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Pretty much all apex predators are perfect for their environment, T.rex was perfectly evolved for taking on armoured prey and decently fast prey

 

It's the same for other predators heres some examples.

 

Giganotosaurus was fast and agile and fairly powerful prefect for taking on hadrosaurs , sauropods and the other large theropods in its ecosystem.

 

Allosaurus was big enough to take on stegosaurs and sauropods and was fast enough to get away from larger and stronger theropods in its ecosystem.

"Somewhere on this island is the greatest predator that ever lived. Second greatest predator must take him down."Roland Tembo"

"Jurassic park: The Lost World"

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Rex Fan 684
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Yeah, I can agree with that(though I'm not aware of any hadrosaurs living with Giganotosaurus, though more primitive iguanodonts did).

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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Hiphopananomus
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That's what I meant, just wasn't specific enough, it's not like there very different. :)

"Somewhere on this island is the greatest predator that ever lived. Second greatest predator must take him down."Roland Tembo"

"Jurassic park: The Lost World"

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Rex Fan 684
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I understand :)

 

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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JRR
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still all had disadvantages, or its prey would of gone extint, for example, giganotosaurus had some competicion in Ekrixinatosaurus, and it had a small brain

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Rex Fan 684
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Don't forget predators don't hunt everyday. Plus they're heavily outnumbered by their prey.

 

An 3+ ton hadrosaur for example could probably hold a T.rex over for a few weeks. Plus there were probably hundreds of thousands of hadrosaurs as opposed to a few thousand T.rexes.

 

Anyways, this wasn't supposed to be about hunting in large theropods.

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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Hiphopananomus
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Oh yes all predators have disadvantages Giganotosaurus had a small brain and competition, T.rex had small arms and tough prey, Allosaurus had a small brain and other larger carnivores to deal with.

"Somewhere on this island is the greatest predator that ever lived. Second greatest predator must take him down."Roland Tembo"

"Jurassic park: The Lost World"

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Hiphopananomus
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Yeah were off topic lets go back to the point of the topic! :)

"Somewhere on this island is the greatest predator that ever lived. Second greatest predator must take him down."Roland Tembo"

"Jurassic park: The Lost World"

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Rex Fan 684
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What I find really interesting is how big a brain T.rex had. One of the biggest compared to body size of any non-avian dinosaur!

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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Lord Vader
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Nice post. Very interesting. Gotta say, if the Cretaceous extinction didn't take place, Rex had the potential to last for millions upon millions of years longer than it did. Maybe it could have been one of the longest lasting species the Earth  has seen (remaining unchanged I mean).

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Rex Fan 684
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I could see it.

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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Hiphopananomus
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It's possible, but, something probably would have stoped it like climate change or something that seems to stop most of the super predators, I myself think that the raptors would have lasted the longest, because unlike rex they wouldn't need as much food so they could live off other small animals that could also survive a climate change.

"Somewhere on this island is the greatest predator that ever lived. Second greatest predator must take him down."Roland Tembo"

"Jurassic park: The Lost World"

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Lord Vader
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I meant among super predators, not the little ones. But, climate change might not have been as much a problem as you think. If Earth got colder, they'd probably go farther south. That, or the ones up north would die out slowly, but the ones further south keep thriving. If the earth got warmer, then opposite of previous situation. 

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Rex Fan 684
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I think what he meant was T.rex could have been like, say, Allosaurus. Allosaurus was around from roughly 140-155 million years. A 15 million year run without changing much. If I'm correct, MrHappy means T.rex could have done something like that(maybe even longer) before it adapted and changed.

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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Rex Fan 684
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Posted that the same time MrHappy posted his, so ignore that if you wish ;)

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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Lord Vader
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That's another way of looking at it though. It's a valid perception. 

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Hiphopananomus
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True, I don't know there's a reason why all of these super predators go extinct ussualy climate change sometimes there prey disappears or sometimes something better comes along.

 

I do think T.rex could definitely go for a long run but, if something changed significantly like there main prey dies out, or something better comes along or extreme climate change I just don't think something as large as a rex would survive unless it changed.

 

Don't get me wrong I completely understand what you guys are saying, I understand that rex was one of if not the most advanced predators to ever live but, I just don't think any super predator is invincible.  

"Somewhere on this island is the greatest predator that ever lived. Second greatest predator must take him down."Roland Tembo"

"Jurassic park: The Lost World"

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Rex Fan 684
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I know what you mean Hipho. No species lasts forever.

"Men like me don't start the wars. We just die in them. We've always died in them, and we always will. We don't expect any praise for it, no parades. No one knows our names." ―Alpha-98
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Sci-Fi King25
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Thanks for sharing this information RexFan!

 

“Banana oil.”- George Takei, Gigantis: The Fire Monster

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Silver_Falcon
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Just feel like pointing out that although rex had a large brain, most of it was purely for interpreting its senses, and its intelligence would be more comparable to that of a crocodile. I'll try to find the study that found this and share it with you guys.

Here, have a waffle (-'.')-#

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