Like MoH said they're probably starting to either get separated by egg laying activity or the hens have actually started setting on their nests incubating their eggs. If they're alone early in the am I'd say they're in the latter stage. This is a "great" time to be hunting. I kind of relate it to the early post rut time frame when bucks start searching in earnest for that last receptive doe. If you know the birds in your area have been hunted hard then go easy with the calling. If they haven't been called to too much then you can be more aggressive with them. I like to take their temp. and start out soft but I will open it up if I don't get the response I'm looking for. If cranking it up doesn't fire them up I do go back to the soft stuff pretty quick.lol Also, patience is really a virtue in the late season. Give em time to work their way to you. I love the late season.

Dan