Today i realized one of my chickens that is about 14 weeks old opens and closes her mouth repeatedly. It's like shes yawning or just stretching her mouth open. I thought maybe she was trying to regurgitate because at one point it looked like something came up that she chewed and swallowed again. The thing is she continued to open her mouth afterwards and it's not like she is straining either. This came on suddenly as she wasn't like this yesterday. ANY info on this would be helpful. I'm new at this so if it's normal i would have no clue and would love to know.
Thanks.

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