Someone had a nice sketch of the tendons, bones, and claws of a chicken when it squats down on a branch. The squatting naturally tightens the grip of the claws. What survival instinct would cause them to loosen their grip when they are sleeping so they could fall out? I’m sorry Debid, that fails the common sense test plus goes against what I see in my coop.
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No need to apologize! I'm frankly glad to hear the "2x4s laid flat are all that works" crew is no longer the vocal majority on BYC. I would like to see those sketches if you have a link. I'm pretty sure it was here that I read over and over about chickens not gripping when they sleep and how their feet are best suited to a flat position. Not recalling those links either, though, if there ever were any. Lots of oft repeated "facts" end up being opinion...