Today I noticed that one of my 15 2.5 months old chicks makes the yawning motion frequently. She still eats and is very active. There's no gargling sound or liquid around her beak. So far the yawning is the only weird thing going on. She's the only one doing it, although every once in a while a chick will have a tiny wet sounding sneeze. I don't know if this is something too, they've been doing this since forever. They are free ranging in my garden so they come in contact with wild birds, which are pretty much only sparrows. We've also had a bit of a problem with mites but it's solved now. So should I be worried? Should I give her some medication?