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In the video Two-and-a-half billion T. rex roamed Earth, study finds contains a short explanation of the results in Science Absolute abundance and preservation rate of Tyrannosaurus rex by the corresponding author of the paper.
I'd like to understand better what is known about T. rex's adaptability and range of environments where it was thought to flourish. It's hard to imagine what things were like back then, so using modern flora/fauna and climate distributions as reference points will help me to understand this better.
Based on that knowledge and reference frame, I'd like to ask about the following Gedankenexperiment:
Question: Would anything limit an "invasive species" T. rex introduction now besides running out of food or intervention by humans?
Would they basically thrive over much of the Earth's surface and eat all the other mammals? Or without a supply of dead and rotting dinosaur cadavers would these giant scavengers with excellent olfaction quickly deplete a small region and die of starvation?
Currently there is not likely enough DNA to reconstruct a full genome nor a scheme to build and incubate a dinosaur egg for it (as far as I know), so we are not at any risk of this happening in the near future.
Lots of things could impact a reintroduced invasive species.
Disease/sickness: although no close relatives are present that is not a guarantee, many diseases jump species. Parasites likewise could cause problems, especially newer parasites the dino may not have a good defense for. Even modern Fungus could pose a problem for eggs.
Predators: While an adult t-rex is predator proof eggs and newborns are not. Rats and other small mammals as well as many birds have been the demise of many ground nesting birds.
Poisons: there are plenty of animals and plants that are poisonous enough kill a t-rex that the rex may not recognize as dangerous. Remember there are a lot of things around a t-rex did not evolve with. This is more dependent on location, a t-rex dropped in Australia might kill itself with its first meal.
Human stuff: I am not talking about humans killing them. I am thinking of the things humans make killing them. things like walking into power lines, eating weird plastic human garbage, car accidents ( a car moving at speed could easily cripple a rex), even something as simple as getting hit by trains