We have a hen undergoing a hard molt. We put her in a dog crate to keep the others from picking on her too much and to make sure she was getting plenty of vitamins and protein. My daughter thought she was lonely so she setup another dog crate next to the first and put another hen in there. Both crates were setup in the grass with no bottom so they could eat bugs and grass. They also had a tarp over part of the crates for shade and boxes for laying and of course pellets and water. We left and came back a few hours later and I went to go check on them and saw that the non-molting hen was sitting in the corner not moving. I got closer and could see she was not breathing. Her head was stuck out through the bars of the crate and her comb and wattles were blue/purple.
We moved the molting hen back in the main coop and plan on wrapping the crates in chickenwire if we need to use them again in the future.
I couldn't find any info about such a thing happening before. The only thing we can figure is that she was chasing a cricket that hopped sideways and got herself in a strange position and panicked. It's probably fairly rare, especially as most crates seem to be kept inside a building and not in the grass, but I thought I would warn people anyway so you can decide for yourself how you want to use a crate.
TL/DR: dogcrates can be wrapped in chicken wire to prevent chickens from getting their heads stuck.

We moved the molting hen back in the main coop and plan on wrapping the crates in chickenwire if we need to use them again in the future.
I couldn't find any info about such a thing happening before. The only thing we can figure is that she was chasing a cricket that hopped sideways and got herself in a strange position and panicked. It's probably fairly rare, especially as most crates seem to be kept inside a building and not in the grass, but I thought I would warn people anyway so you can decide for yourself how you want to use a crate.
TL/DR: dogcrates can be wrapped in chicken wire to prevent chickens from getting their heads stuck.