Ah!
there you go then
. little Dilly bore out my theory.
I once had a horse who was turned out into a field with a stream in it. When I turned him out there I would often stay and watch him for a while observing his patterns of behaviour and interaction with the other horses.
Some times he would look relaxed with his head downwards and would amble off to graze but occasionally he would carry his head higher, looking alert with his ears forward. On these occassions he would always wander down to the stream for a drink. I got so used to this expression as an indication of his thirst that I was able to notice when he needed a drink.
He moved paddocks, and had to temporarily share a field with some very dominant horses who would often guard the water trough and prevent him from drinking. When I turned him out into the paddock after a ride I would ask him if he wanted a drink and look and point in the direction of the water. If he did the drink face I would walk towards the trough and shoo the horses away. Once I had them at bay he would follow and drink in safety.
I shared 20 years of my life with that horse so you might say that we should have had that level of communication, trust and understanding. Though some people never seem to learn anything about what their animals are trying to say to them no matter how long they keep them.
Understanding chickens is much harder than horses but just as rewarding.
Buffy