Is this an acceptable amount of open mouthed breathing?

I’m asking mostly about the black hen, but you do see the Bielefelder doing a little as well. I have a second clip of the black one doing it more I’ll try to put in the comments.

They’re 8 weeks old and it’s 79 degrees. They’re under this metal reflective tarp so it’s nice and shady. I do think she was sun bathing a bit before this clip. I saw her on the camera laying sprawled out in the sun. That’s why I went to go check. By the time I got out there, she was up pecking around like you see in the video.

We’ve definitely had hotter days than this so far and she didn’t have issues. The highest so far this spring has been about 90 degrees so I think 80 should be just fine.

Being out in the run is pretty new so maybe she’s also overly excited?