My blue tongue lizards bloated stomach.

Question
My Blue Tongue lizards stomach bloats occasionally. I don't know why it bloats. Is something wrong with him ?
What could it be ?

Answer
 The fact that is is occasional shows that this is not something endangering his health.  Many reptiles fill up with air and look bloated in order to look bigger to something they perceive as a predator, but most often it's just simply part of his digestive process.  Reptiles conserve water very well and extract water from the food in the colon, this takes more time and since he will still eat in the meantime, cause the digestive tract to distend until he is ready to eliminate.