Rancher Hicks, doubt that it would qualify as research, but I have seen fox standing against my fence and peering in at my birds. Yes I do "mark" areas around my coop. Maybe testosterone levels are just too low at 69 yrs old? For the past ten years or so, I have been snaring fox around a beagle club that I belong to. ( placing snares in a 50 acre area.) The least I have snared in a year is 8, and the most I have snared is 28. This is over a three month legal trapping season. Being an older guy with BPH, I need to "mark" frequently. By their tracks in the snow I see where fox walk right by my "marking" posts. Again, not RESEARCH just my observations. Habituated to humans means so accustomed that wild animals are no longer fearful. It happens more and more as we enter their domain. Just because one has not personally seen something does not necessarily mean that it is incorrect. In less populated areas, human scent may have a more dramatic impact. Here in NJ with hunters peeing all over the woods, fox are less fearful. Again this is not research just based upon the observations of an older guy who has spent as much of his life as is possible in the great outdoors.