I think that swamp is right. There are areas around here that are loaded with coyotes. I have found that hunting around here the time of year also plays a huge factor in where coyotes are located. Over the years, I have found that areas around the lake are loaded with coyotes in the winter time. They seem to like the thick cedar areas close to it. For example, in early fall, during deer season I usually see and hear quite a few coyotes. but as soon as deer season ends they are hardly any to be seen or heard (this is all miles from the lake on my dad's property). But when I hunt close to my house (near the lake) everynight you hear differnet packs howling. Do I call in or kill a coyote on every hunt? Heck NO! I have to cover quite a few pieces of property but when I do get a response, it's usually by more than one pack. (still can't always finish the deal but I am trying!)
For another example when I was recently home on leave my brother took me to some state land that gets absolutely hammered by deer hunters (very few come out with a coyote or even see one) but it was by the lake with some thick cover. We set up near the road because my wifes van wouldn't make it into the parking area and decided to watch the access road that goes through the state land. My brother let out a locator howl and we immediately had a pack open up in front of us, behind us and off to our right, all at various distances. My brother thought that they would make their way down the road behind us so he went to make sure that he could see in that direction. When he got to his spot he let out a female invitation howl that set the woods off in front of me about 70 yds away. You could also hear the pack open up to our right again (way closer than last time) and then I heard a shot by my brother behind me and a lot of swearing (see we screw up way too much!) He had missed a chip shot because his safety was on and by the time he got it off the coyote had seen him move and took off back the way it had came.
So I guess instead rambeling I should get to the point. I am not suggesting that all of the coyotes migrate to the lake but I think that they follow there prey. My dad's property is great during early fall but as soon as the snow hits might as well sit in my living room and call. You have to go where the animal is. I have started carrying rifle (when I am home) in my vehicle with me when I go to town by some of the properties that we hunt, because it isn't uncommon to see a coyote trotting through a field. I learned my lesson the hard way when I was driving to Adams and in the field that my brother and I frequent, there were four coyotes out in the middle of the field heading towards a block of woods four hundred yards in front of them! That's not to say that all of ny is like that but I know that there are quite a few coyotes around my neck of the woods and after years of hunting them we are just now starting to get our success rate up. Just by trial and error.