Oh, so when animal herds were thriving prior to man being around there was a natural system for wildlife management?
Btw, did your history in middle school tell you when the first of the colonist started arriving from Europe they were literally stunned by the variety and massive numbers of wild life in America?
Actually, yes.
There are more whitetail deer in America now than when the pilgrims arrived. They prefer agricultural fields and clear cuts more than old growth forest.