Simple. I contend most deer in the U.S. are paranoid schizophrenic psychotic vampire deer that behave much different than the natural propensity. One exception I'm familiar with is the deer of the Kings Ranch in Tx. There because of a century of essentially no hunting they behave as nature intended not having been grossly harassed by man.
Unmolested deer only use heavy cover lightly. They prefer more open country where they can see and escape predators such as lions. For the most part deer prefer savannah type environments much like the planes of Tanzania Serengeti Unmolested deer move according to weather ,temperature, moon, daylight hours and the natural cycles of the year not as dictated by human pressure. In a natural herd the b/d ratio naturally balances itself at about +/_ 1.5 to 1 ish does to bucks. In a natural herd the age distribution ranges from fawns to an ample sampling of 6 yr old to much older deer. This has a profound effect on all aspects of social behavior.including which bucks do the breeding how mothers teach children nourishment , safety, flood avoidance, thermal adaptation etc etc.
You drive around my ranch in the summer and you'd think nothing exists there. Everything is nocturnal. That gradually shifts into the fall and winter as weather cools and the rut kicks in.Full moon in December, you won't see a deer early or late but strong midday movement. We have some very heavy brush on the ranch. No deer there. They are in the more motted country for the most part. The odds of anything younger than 4 breeding...,zero. The biggest issue deer on the ranch deal with are 1) lions 2) climate 3) getting killed by other deer 4) probably rattlesnakes. Man isn't on the list
I could go on. This what you are looking for?