They may not roost in the same spot every night like it was stated before, but my guess is that they are quite because of recent pressure during the past few years. The best way I know how to kill pressured birds or bird that will be pressured before you hunt them it to just do some soft purring and then imitate a fly down with a wing or your hat. If he answers your at anytime, including the fly down, just sit tight and he will be there eventually. Just have your decoys set out, if you can, and wait. I have killed two birds this way; the first came in within 15min and the other later 2.5 hrs.