It isn't just chickens that learn to congregate outside the door where they know where their source of food is. I have wild turkeys that show up at my bedroom slider most mornings at dawn so I am sure to see them as soon as I wake up. This morning, though, there's a foot of snow out there and...
It's obvious. They want in where it's warm, and of course they also expect to be invited to dinner. Chickens learn quickly which side of the glass is where the good stuff is.