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...
*Trying to save anything that creeps, crawls, swims, flies, or breathes, since early childhood*