Megamisama, Donator
Tyvärr är iprincip hela dess hjärna till för luktsinnet, vilket gjorde dess förmåga att känna lukter mycket bättre än hundars och hajars, så det hade nog inte funkat så jäkla bra.
Porryhatter, Donator
Q:
How do they know that the Tyrannosaurus Rex hunted based on movement?
Just had some random thoughts and this popped in.
They know that the 'T-Rex' hunted based on movement, i.e. as seen in Jurassic Park, if you don't move then the 'T-Rex' cannot (in a sense) see you.
How do they know this?
A:
First of all, nobody knows that. Second of all, nobody who studies dinosaurs really thinks that either.
Based on what we know of the brains (from endocasts) of Tyrannosaurus rex and the eyes and vision of its closest living relatives (birds and crocodiles) it had a very keen vision, quite possibly better than any human being in some ways. Not only that, it's facial structure had adapted to allow it binocular vision and allow it to see "over" its snout like a wolf does. These are not the kinds of adaptations you expect to see in animals with poor, movement-based vision.
The reason the dinosaurs in Jurassic Park (the novel) had movement-based vision was because the scientists putting dinosaur DNA together had basically screwed up, filling the bits missing from genes controlling the visual cortex with frog DNA. Frogs really do have movement-based vision. This explanation, along with many, many others, were left out of the film, leaving viewers with the idea that the dinosaurs were really supposed to have such vision naturally, which is of course false.
http://answers.yahoo.com/question/index?qid=20071124150257AAvQ1hQ
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