My female beardie is almost 2 years old, and recently she has been doing this weird behavior. She often opens her mouth even when she is not basking or mad, and she puffs her body with air. I also can sometimes hear crackling noise in her throat, which I have heard is supposedly mucus. I thought that she might have upper respiratory infection (UPI), so I took her to the vet. However, the vet just said that this is just a random behavior that means nothing. I am having some doubts about what he said and wanted to ask for your thoughts. Thank You! 
This is a picture of her puffing
This is a picture of her puffing
