Open mouthed cuckoo maran chick

[Penpike]

My cuckoo maran chick is about 3-5 weeks old and I've noticed whenever I'm in the room we keep her in, she has her mouth open a lot. While the other 2 chicks are over eating or something she is normally lying down, again with her mouth open a lot. She does eat and drink normally just not at the same time as the other chicks. Also, she has a lot of just featherless skin above her wings. Should I be worried about any of this?

 

[cary 1973]

are you sure she is not to warm