OK, thank you. I have been pondering this for a while.Yes visual only......takes some experience looking at both active and non active layers to tell the diff....and I still find pelvic spacing to be the best indicator.
I can tell lots of differences by the powers of observation. So this will be something I start to compare. I guess it will be most helpful in determining if a suspected layer is a hiding a nest since that's my only actual concern of whether they are laying or not.
I didn't want to accidentally violate a hen.