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There were smaller populations of humans, but not smaller populations of mammals in general.

With our skill at making meat, I wonder how true that is.

Bison are much better at making meat than we ever were, before we all but wiped them out. Google piles of bison skulls for a peek.

I think the comparison is hard more than it is obvious. There's an awful lot of humans, pets and livestock.

A quick google search shows around 5 billion goats, cows, pigs, and sheep, 1.5 billion cats and dogs, and 8 billion humans.

Compared to an estimated 130 billion wild mammals. That’s without the vast herds of herbivores that used to roam the plains of the world.