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

The simplest answer: We ate all of them. Megafauna ( the gigantic animals like giant sloths and mammoths) consistently die off as soon as early man shows up in the places where they live, and there’s evidence of us hunting them. They were our favorite foods, and we ate them to death.