Behaviour studies are notoriously difficult.
Some of the problems are obvious. They take an enormous amount of time in observation. The circumstances/environment the study is conducted in has a massive impact. What is normal in one set of circumstances isn't in other circumstances.
Even with my very small group of who I consider to be reliable observers our obsevations often lead to different conclusions and we go over the details fairly thoroughly and adjust the conclusion accordingly.
Take this for example.
From my observations I came to believe that moulting hens went off commercial feed. Now if commercial feed is all there was to eat then the drive to hang on to life would in most instances force the hen to eat whatever was available or die. I haven't read any accounts of moulting hens dying of starvation.
One way to try and put this theory to the test is to create a poll which I did.
Here is the poll.
https://www.backyardchickens.com/th...off-their-usual-feed-when-they-moult.1498056/
What to make of it?
Well it is a problem observed by some is a reasonable start.
It's also reasonable to guess that those who voted yes have observed this at some point.
Polls being what they are and people being what they are a proportion of the no votes will be people who just haven't observed this. It doesn't mean it isn't happening though.
There are according to the poll experts those who will just vote no, perhaps through trolling of a kind, perhaps because they have disliked something else the OP has posted.
Roughly, the poll experts have it the yes votes are likely to be more reliable.
So just on the yes and no votes even if you don't account for poll slanting there is a 50/50 split.
Include the other two options and it's reasonable to say there is a problem with hens going off their feed when moulting.
I can't recal ever having seen this dealt with at any depth on BYC which is a chicken related forum. There are no articles about it that I could find. No "educator" advice on the subject, yet 50% of the votes suggest the problem is real.
The often trotted out catch all is every hen is an individual and different etc etc.
This may well be true but a group of individuals can and do exhibit what we would describe as "normal" behaviour. In the statistical bell curve there will always be the outliers but the norm falls within a fairly well defined range.
So far I've read more reliable reports of roosters prefering moist soil for bathing than not. I think there is an issue here that warrants further investigation.