I took out one of my juvenile crested geckos the other day and noticed that he was kind of hiccupping. His neck was sort of flapping in and out and he was licking a lot. Kind of seemed like he had to burp, but no noises or anything. I tried to open his mouth and from what I could see it looked normal. He seemed very excited and active as usual. Is this normal behavior in cresteds? I just worry b/c I have a snake with a slight respiratory infection...