Just out of curiosity is this normal? I noticed it looks like they are trying to crow or churp loudly?
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Chickens of all ages will make a yawning motion when adjusting their crop - so it is a behavior that can be perfectly normal. However, knowing a bit more about what you are seeing in your bird(s) would help in determining if this is what is happening or if it is something more concerning. How frequently are you seeing the motion? Are the birds otherwise eating, drinking, pooping and behaving normally?