Why were prehistoric era animals so gigantic in comparison to animals from the “modern era”

Question

Why were prehistoric era animals so gigantic in comparison to animals from the “modern era”

In: 1281

Answer 1

What are you specifically referring to? Dinosaurs?

Dinosaurs got big because of their special bodies that were made to better handle mass on land, such as having hollow bones and air sacs

Mammals haven’t been much bigger than as they are today. There was more variety in the ‘big’ animals but the sizes themselves weren’t too different. On land there were some bigger than the modern African elephant, but not by much

In the ocean the blue whale is the largest known animal to ever live