In the morning tisha blows out her beard and sits with it out for like 5 mins. not black though, just stretching i think.
And then she does it again in the evenings again not black, but it look likes she has trouble with it. Its hard to explain but her beard will come out almost parallel to her mouth and then she shakes her head and it goes down a bit and then it'll keep happening until she settles with it nicely puffed out.
My boy occasionally does this, but he's never gotten his beard stuck. I think it's just another way of thermo-regulating, though. With the beard blackened and puffed out, it's more surface for them to absorb heat. I may be wrong, though. But as long as it's not accompanied by aggressive behavior or the beard getting stuck, I think it's normal.