Hi! I'm currently in transit from Wyoming to South Dakota to visit family - with two of my chickens. One requires medication at the moment, so I decided to take her with me, and I brought another one for company. They're in an open dog crate with shavings and food and water and all that, but they keep stretching their necks and doing the mouth open thing, like a yawn or when they have something stuck in their throat. Is this their ears bothering them, from changes in altitude...? I'm sort of paranoid about the stress. They're not really eating or drinking, just laying down and seemingly trying to pop their ears. Any advice/confirmation?