Sometimes my veiled chameleon (4 months, male) will open his mouth really wide for about a minute and squirm his body around randomly. I tried feeding him to see if he was hungry, but he didn't eat. Is this a bad sign?
A yawn, twist to the side followed by a shudder? Does it usually happen shortly after they’ve warmed up for the day? If so, it’s perfectly normal and I, personally, all it their morning stretch but others may have other pet terms for it. I can’t give any physiological reasons or if they do it leading up to a shed for it but all chameleons do it.