Feels like there was a lot more megafauna in prehistoric earth than there are today
In: 20
That depends on the time period. Ppl like to talk about giant insects when there was much more oxigen in the atmosphere,but there werent really a lot of those afawk. One reason why Dinosaurs were big is that their respiratory system was like those of todays birds. They are able to use much more oxigen much more efficient than us mammals can. This gave them the possibility to become much larger.
After they all died, the smaller mammals were more likely to survive, which is why they are predominant now and we just cant become that big on land.
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