The Sforno has an interesting pshat on chet kaf bet, that the post flood world is now set in an unnatural order from the changing of the earths axis and orbit, that the original setup had no seasonality (perpetual spring) and that is the cause of optimal growth of plants, animals, and people.( the long lives). And that this will eventally return, base on Yeshayohu, and Tehilim. This closely matches the sudden change to meat eating, and the cosmology/causality discussion on Brochos nun tes bais. (ceidit to Daf Yomi)
The was also a quote of the Mahatz Chajes somewere that allowed dinosaurs and other curiosities because the time frame of creation might have been reckoned otherwise than our concept of days.
And, the Torah lists “the taninim gedolim” as created between the fish, birds, and terrestrial creatures. That some meforshim take them to be the livyoson does not lead to an easier understanding.