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Not really. Oxygen content was higher in the Cretaceous, which would have a positive effect.

@@MadlyMesozoic hmmm but.. there is such thing as too much oxygen. Humans would go loopy if they were in the Cretaceous, it would be like being drunk. I'm not sure how orcas would react due to being larger animals, but there has to be some sort of affect, especially given they take a breath and then dive right?

Well, you're not sure because you're not well informed on how much oxygen is too much oxygen, but no worries. The highest oxygen content has ever been on the planet is 35% during the Carboniferous- the Cretaceous being likely below 30%. Oxygen toxicity occurs at 50% oxygen, which is really only achievable in a hyperbaric chamber or direct inhalation of pure oxygen. Hence why I never mention it in my videos.

@@MadlyMesozoic interesting. Then what are your thoughts on T-Rex in the modern era then? Would large warmblooded reptiles be able to adapt to the air content? Or would it be like plenty of news people say which is: "They'd be out of breath all the time"? ( I don't usually trust web news articles, they tend to only give the bare minimum info and overdramatize things for the sake of clicks, or they report on totally nothing with clickbait news titles, especially with dinosaurs imo)

@@MadlyMesozoic also.. thank you so much for responding, I know your time must be valuable.