around here we have both...and reds and blacks....in one oak stand i can find both grays and foxes....and have shot both....but foxes seem to hang more in the big oaks always feeding their fat selves...and they do seem to jump more limb to limb..and they seem to bark more...giving them selves away but also alerting other rats....but if your sneaking through and hear one start barking stop and try to pinpoint it and sneak in....alot of times they will stay until your pretty close....i dont know where they will be this late in the winter....well never mind...looks like your in NC...my squirrels are almost in hibernation....coming out rarely.....down there they should be out but i dont know.....if the others are out foxes will be.....grays seem to be a bit more....elusive then grays...they seem to be more careless and just worried about food....heck i shot 2 out of the same tree with a bolt action 22...both landed within a foot of eachother.....they could care less that i was standing at the base of the tree....they were getting nuts...i love hunting tree rats reguardless of color....but i never really noticed areas that have grays and not foxes i mean some areas seem that way but they seem to be the same kind of land.....they just never intermixed in that area i always thought....but i like to get in a nice stand of nut trees and have at em....good luck!!