Feels like there was a lot more megafauna in prehistoric earth than there are today
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The ocean still has large animals, so I assume that your question refers to land animals. Two extinction events to consider are the one that wiped out large dinosaurs and the modern man-made extinction event. There is a theory that burrowing animals were able to hide from the effects of the asteroid impact while large animals had no place to hide. Small animals can hide from humans. We developed the ability to kill large animals.
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