There's a lot of talk and opinions on the ideal roost type - board vs. branch, size/diameter, flat side up vs. not, etc. and the reasoning usually revolves around toe warmth winter - whether the body feathers will cover the toes and keep them warm when the chicken sits down.
This all makes sense in theory, but I'd never really thought about, or checked, what it actually looks like in practice. The anatomy of where the feathers go relative to the toes. I imagine this will depend on the breed and the degree of fluffiness. I decided to test it out on my chickens, which conveniently happen to be of two breeds with very different degrees of fluffiness - English Orpingtons that look like giant fluff balls, and Barnevelders that are small and have minimal fluff, looking more like pigeons. I have a chicken cam with night vision in the coop, so I checked on them while roosting, took pictures and examined their feet closely (for science!)
What I found is that I couldn't see any toes on any bird, regardless of how fluffy it is! My roosts are thick branches, but there's so much of the body overhanging the feet that I can't imagine toes showing even if this was a narrow roost. The fluffier birds especially, look like they're sagging and spilling over the roost on all sides, and it even looks like the roost is inserted in the middle of a giant round cotton ball!
Even with the skinnier and slicker Barnevelders, there's still a lot of body overlapping the feet. They'd need to be sitting on bean poles and going through a massive molt to show any toes at all.
So my unscientific science conclusion is that roost type probably matters more in terms of comfort (no sharp corners to dig into their feet) than in terms of warmth. If anybody has pictures of toes showing underneath the body, post them and prove me wrong!
Cotton ball spilling over the roost:
Cotton ball with roost going through the middle, in a ridiculous-looking butt-up sleeping position:
Non-fluffy bird not showing toes, next to some more saggy cotton balls:
This all makes sense in theory, but I'd never really thought about, or checked, what it actually looks like in practice. The anatomy of where the feathers go relative to the toes. I imagine this will depend on the breed and the degree of fluffiness. I decided to test it out on my chickens, which conveniently happen to be of two breeds with very different degrees of fluffiness - English Orpingtons that look like giant fluff balls, and Barnevelders that are small and have minimal fluff, looking more like pigeons. I have a chicken cam with night vision in the coop, so I checked on them while roosting, took pictures and examined their feet closely (for science!)
What I found is that I couldn't see any toes on any bird, regardless of how fluffy it is! My roosts are thick branches, but there's so much of the body overhanging the feet that I can't imagine toes showing even if this was a narrow roost. The fluffier birds especially, look like they're sagging and spilling over the roost on all sides, and it even looks like the roost is inserted in the middle of a giant round cotton ball!

So my unscientific science conclusion is that roost type probably matters more in terms of comfort (no sharp corners to dig into their feet) than in terms of warmth. If anybody has pictures of toes showing underneath the body, post them and prove me wrong!

Cotton ball spilling over the roost:
Cotton ball with roost going through the middle, in a ridiculous-looking butt-up sleeping position:
Non-fluffy bird not showing toes, next to some more saggy cotton balls: