Not what I said at all. Try reading my post again.
Couple facts:
Dozens of large animal species disappeared in a very brief period, from a historical POV.
This occurred shortly after the most widely accepted date for humans arriving in the Americas.
I am not stating that B caused A, only that if there were no connection it would be a truly amazing coincidence.
There are lots of explanations proffered, but none that make a great deal of sense.
As for the “climate change” being to blame idea, the extinction did occur shortly after the end of the last glacial period. But many of these species had lived through a dozen or more glacial/interglacial cycles, but disappeared all at the same time after the most recent one.
Not limited to the Americas, BTW. The only parts of the world where megafauna survived in large numbers are those areas where humans and the megafauna are claimed to have evolved together, Africa and South Asia. Everywhere else the megafauna disappeared, and generally within a short time after humans arriving.
IOW, heck if I know.
Thanks Sherman, I just always figured there was some catastrophic event did the deed. As you said, they were conditioned to the cold. the Quails in my state were to, but the cold of 1976 in my state killed nearly all of them.