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Megafauna are going to have low birth rates and be easy to track and cull. So the risk seems fairly low compared to say insects or seeds or bacteria that can never be reigned in once they are out in the world.

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Not always: https://en.m.wikipedia.org/wiki/Pablo_Escobar%27s_hippos

Although I think that’s because people object to killing them. But that could also happen with megafauna.

I wonder if, even without finding human cities or remains, you could infer our existence from the fossil record, from the layer where a boatload of plant and animal species went from being localized for millions of years to being all over the place all at once.

And the burnt plastic https://en.wikipedia.org/wiki/Plastiglomerate

Yeah, those hippos could all be killed in a week by a few sharpshooters and a helicopter.

We did manage to wipe them out once.

That's debatable.

There's good evidence for asteroid impact(s) at that time period, and hugely dramatic climate change - swings of over 20 C in the average temperature in the north.

We don't know for sure.

Any references to this kind on swings happened ever, or in specific time?

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