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[Helikaon]

this has come up quite a few times, some snakes seem to get this due to the size of the food offered. i believe some snakes just inflate it as well for no real reason, but i have also seen it due to protazoan infections causing the animal to produce a tonne of saliva which sits in teh throat causing the pouch. this can be confirmed with a fresh feacal sample. whether it all just depends on finding the cause and this would best be done by a good reptile vet.