How do scientists know that a T. Rex's eyesight was based on movement?

Answer 1

Scientists make hypotheses about T. rex's vision based on analogies to living animals and analyses of the fossils that we have for the species. Scientists don't "know" how T. rex saw, but they can make reasonable inferences. Of course, these hypotheses change over time as we learn more about T. rex through new fossil finds and better data analysis. The image of T. rex presented in the movie Jurassic Park - as a predator that couldn't see you if you stood still - has been superceded by the idea that T. rex had the eyesight of an eagle.

The closest modern analogues to T. rex based on anatomy are probably not crocodilians, but large bipedal birds (birds are technically living dinosaurs according to cladistics, by the way). These birds generally have excellent vision that does respond quickly to movement but does not require an object to be moving in order to see it. Scientists have been able to examine the brain anatomy of T. rex using CT scanning, and they have found that tyrannosaurids had well developed brain regions for processing visual information, as well as olfactory data.

New analyses of T. rex skull anatomy also indicate that tyrannosaur species evolved better binocular vision over time by narrowing their snouts and enlarging their eyes. Recent speculation is that T. rex may have seen better than an eagle, and far better than a human.

Answer 2

The T-Rex was a binocluar animal meaning its eyes were mounted in the front of the skull.

"Some evidence exists that suggests hunting behavior in Tyrannosaurus. The ocular cavities of Tyrannosaurs are positioned so that the eyes would point forward, giving the dinosaur binocular vision. A scavenger might not need the advanced depth perception that stereoscopic vision affords; in modern animals, binocular vision is found primarily in predators. Bite marks in other animals and even other tyrannosaur fossils suggest predatory behavior."

If an animal from the period of the T-Rex was camofloged well enough the T-Rex would be much less likely to "see" its prey. Kind of like todays preying mantis. Unless it moves most people do not see it and neither do its predators. T-Rex also had a very good ofactory system. It could probably smell the prey but unless it moved couldn't see it.

Answer 3

The scientists know that a T-Rex only saw movement and that the raptor hunted in packs etc etc all from fossils by studying the space between the eyes of the T-Rex, the distance which connects the eyes to the brain and according to their height, the space between their feet, the size of the olfactive cavity. And for the raptors they certainly have found fossils of raptors around a prey so they can affirm that raptors hunted in packs. But to know the truth about how the dinosaurs lived and hunted it would be better to find a live specimen but it will not happen... so all the study rest on theories. I have always asked myself why the scientists thought that all (if not many) dinosaurs were covered with scales... because, for my part, I think that those animals were not all scaly as it is thought but certainly hairy too... as many animals we can see today... Or maybe was it too hot on those times so that they didn't need to cover themselves more !

Answer 4

T Rex Eyesight

Answer 5

Without researching the net for the answers, I believe the reason they know this is due to past research on reptiles. We know that they have specialized eye sight which has a greater field of view than ours. And by studying their lifestlye you can see that their vision is calibrated to rspond to any movement. How else would they be able to catch their prey. So apply the fundamentals and just multiply it on a larger scale and you'd see that T Rex was just one big *** reptile.

Answer 6

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Answer 7

They watched Jurrasic Park.

Umm... that's a good question for a change- I'll be watching to see what interesting things people say! :)

Answer 8

Based on the shape of the orbit hole in T.Rex skulls, they make "educated guesses" about the kind of eyes T.Rexes had. They compare that with other creatures they have examples of, and consider that along with the "Predatory niche" that T.Rex apparently inhabited. They do it the same way you might look at a set of tires tracks on the road, and conclude "hey, someone skidded here!". There is always a (infinitesimally small) possibility that someone came and carefully painted skid marks on the road with rubber paint, but your conclusion that someone skidded is probably pretty sound!

Answer 9

One scientist stood there and asked the question "Can you see me now?", and another scientist ran away and was eaten by the T-Rex. That's how they know.

Answer 10

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