One thing to be aware of is too much cage height if transporting very many birds in the same cage. Had a recent experience. Someone was traveling nearby to buy some birds, I was looking for a way to get birds near to where she was from. She graciously offered to bring my birds back with her. She had a large wire dog cage, suitable for a great dane, wrapped by a tarp in the bed of a pickup truck. There was ample floor space for all the birds, all same breed and size. During the return trip they climbed into a pile and smothered two hens. If they had been in a lower height cage(chicken crate) they would not have been able to play king of the mountain. I suspect the chicken crate is shaped as it is to both maximize hauling capacity and reduce losses. I would not recommend a standard chicken crate for transport to shows because of potential feather damage, but for general use they are very handy, I use wooden turkey crates for my large fowl brahmas.