this post was submitted on 15 Nov 2023
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I don't think he would last long with our current oxygen levels, there is a reason why such giant creatures don't exist anymore.
On top of that like comments said if we just waited out he would starve to dead, even if we were not provided food.
*Edit
Well looks like I was wrong, thx for clarifying that out.
Really though the reason for big animals not being as prevelant anymore was really the oxygen levels Idk where I got that from.
But then it is really weird how the evolution meta didn't evolve back to the huge beasts we see on books, someone said in the comments that it was due to the mammals success, if so it puts things really into perspective.
Yes, it's because of an asteroid.
Large dinosaurs were significantly larger than large mammals for basically the same reasons that birds can fly much longer and higher than bats: hollow bones and significantly more efficient lungs. Flying birds can also get much larger than bats, despite both breathing the same atmosphere.
Dinosaur lungs worked the same way bird lungs do. Their lungs are rigid, and there's separate sets of air sacs that work like bellows to pump the air through the lungs in a single direction. Much like fish gills, there's cross-current gas exchange so they cab extract most of the oxygen from the air.
Oxygen levels weren't really any higher. Dinosaurs just had some adaptations that let them both get bigger than other groups of animals and be better at flying.
The better question is why large birds haven't re-evolved. That's probably just due to the success of mammals. 10 ft tall "terror birds" evolved in the Americas, but went extinct within the last two million years due to competition from mammals. Birds could get larger than elephants, but first an elephant-sized bird needs to outcompete elephants.
Damn, just got my feet wet into the so called "Terror birds" and they are really cool, to think us mammals ruined the chance of such glorious creatures rule the world feels odd.