You can learn how many are in a flock and get some good ideas where they roost if you get late evening pictures. They will roost wherever they find themselves in the evening, not always in the exact same spot but often in the same general area. Being in the woods sitting quietly in the evening you can learn much more from the sounds they make going to roost. Once they fly up they cackle and cluck and make a lot of noise as they fly from tree to tree and until they all settle down at dark. This period of settling in for the night can take 30-45 minutes or more and you can really zero in on them. Then be there in the morning and listen and watch as they fly down to strut. As long as a gobbler has hens coming in to him, he will strut the same field day after day. Maybe in different parts of the field, depending upon where the hens are answering in the morning. A gobbler may roost anywhere around the field, but still strut the same field for days until the hens don't come or he hears more hens answering somewhere else, and then he will try and move into some other Toms' field. Anyway if you know they are in the area there is no point spooking them more than you have to, so start looking for roost sites just a few days before you hunt, or locate a flock the night before you hunt. They will usually strut near a water source and the hens, once bred will nest within 30-50 yds of water so that they don't have to leave the nest long to drink. I have often called birds accross the creek and found them strutting right up to the creek banks and have shot them across the water. Of coarse this may not be the case with all turkeys everywhere, these are just experiences I've had for 25 years in a very small area of the world.