Well i think that it had little need to evolve over the years because it had no predators that would go after it.

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    Regular bog-standard evolution happens over generations and centuries. The T-Rex is not a member of the Zerg. – Radhil Apr 6 '17 at 12:21
  • Everything needs to evolve otherwise it goes extinct... oh wait. on a separate note @Valorum I think we see a baby T-rex in the second movie. – revenant Apr 6 '17 at 12:21
  • @revenant - I forgot about those. I'm assuming as a form of trauma-induced amnesia – Valorum Apr 6 '17 at 12:29
  • "it had no predators that would go after it." From what I understand, the T-Rex was pretty much top of the food chain (an apex predator) in its heyday. If it evolved, it would be more to do so because of a changing environment, or changing prey (or a prey that was changing because the environment was changing). – Andrew Thompson Apr 6 '17 at 12:53
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    Why did the human species never evolve in any of the Godfather movies? – starpilotsix Apr 6 '17 at 13:06

Evolution is the process where life-forms change over successive generations, either as a response to natural selection, genetic drift, random mutation or gene migration. Changes due to natural selection (which includes predation) will usually take several generations.

Given that there have only been four Tyrannosaurs seen in the film series (1, 2, 3, 4) and given that all but one appear to be the result of genetic manipulation and artificial breeding rather than natural sexual gene transfer, there simply hasn't been scope for any selection-based changes to take place.

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