Mostly the same ones as now (except for a dearth of dogs … they were still mostly wolves),
but there were mastodons, and saber tooth cats, and giant ground sloths, and horses.
all of which were well adapted to cold weather.
It COULD have been that man hunted them to extinction –
or there might have been a meteor strike on the north American ice shield,
since horses were not made extinct in Euro-Asia.

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