Chooks may be creatures of habit but in my experience they are smarter than most people know..
Mine have learnt the sound of the back door opening. Soon as it goes I get "bawwwwwkkkk" from Maggie. "Let us out to plaaayyy!" They can't even see me, they just know that door opening = human coming outside = probably getting let out = HURRY UP!!
I've been bringing Michonne and Daryl in the house for extra food, because they're on the skinny side (and Michonne is getting butt wipe downs and vent gleet treatment) and neither of them even do the funny little "squat and wings out ready to fly" pose when I lean down to pick them up any more. In fact Daryl comes into the house herself because that's where the yummy food is. Eugh.
I love that pose.