I believe it! I bought a really small prefab to segregate an injured chicken once, and when they were all back together I found 6 of them crammed in there. I had to close it up and make them go back to the larger coops.My roosters both face the wall so their long tails trail over the edge of the poop boards. Never have seen them face the other way.
Here's a riddle. How many chickens can cram into the last four feet of roost space? Answer: Fourteen. Saw this last night after the flock went to bed scared of a predator lurking outside.