i keep balls carpets and GTPs and all of them do it from time to time, aside from realigning the jaw, they seem to do it when i wake them up in the middle of the day just like we yawn in the morning. wether its just "waking up" or stretching i donno, but then again, don't we usually stretch when we yawn in the morning anyways?

i always think its cool when the GTPs do it, their teeth are huge.