That's very cool! You know, I have noticed the same behavior going on now with the three Cynops Orientalis that I have. The largest one is the one which begs the most and seems to have an endless pit sometimes for a stomach. I have had to stop feeding her upon occasion because she will literally stuff herself to the point she looks very fat like a sausage that is about to burst it's casing, and has to immediately shed her skin when she is done eating.
I have to regulate for her how much she gets so she does not over-eat sometimes. I think the others are male. They know when to stop eating for the most part, although there is one curious little fellow who sometimes looks a little round for a while when he is through.
I think he is just trying to catch up to the others in size.
Have fun, and thanks for posting! It would be cool if you could get some pictures...
Critter Mom
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*Trying to save anything that creeps, crawls, swims, flies, or breathes, since early childhood*