I have noticed that they tend to be in pockets and that for a few years most of the coyotes in an area will be close to the same color faze, I think that if they were checked they would all be related to each other, with the area spreading out like if you were to pour water on a flat cement floor. It's pretty interesting how the coyotes are, some of them have strong dominate personalities and they will pass that on to their young along with their color faze. Then over a few to several years those traits will get diluted with other genes from surrounding areas and you will see other traits become more dominate in that area. I have also found that when I thin an area out that the remaining coyotes will be more cautious, maybe they were and that has kept them alive or maybe they are just a little more on edge because they are by themselves, like when they are during fall dispersal or at the beginning of breeding season and looking for a mate so are trespassing and exploring new territories.