I've got a 3 year old ball python, about 1500 grams. I fed her 1 small rat and 1 medium rat on 9/17/17. Everything was fine. 10 days later (9/27/17), I fed her 2 small rats. She took them both and seemed ok. I feed fresh pre-killed, so there's no thawing or temperature issue to deal with. Three days later (9/30/17) she regurgitated one rat. I presume she would have fully digested the two from the 9/17 feeding (and there was a defecation afterwards), so it was likely from the 9/27 feeding. I cleaned her bin out, dumped and refilled her water. The next day, she had defecated. There was a lot of liquid (evidenced by wet aspen), and some brown excrement that was not 'runny', but also not hard and 'turd-like'. She's been pretty still, and coiled. She's alert, but not moving around much at all, except for a few minutes after I moved her to clean her bin, and look her over. Before settling back in, she drank a lot, but by and large, she's just coiled in the back of her bin, I assume to soak up heat to help her digest whatever is left over in her belly.

She's in a rack with 6 other snakes, who are all healthy and eating. The room is temp controlled at 79, and heat tape on the back of the bins provides a hot spot of 88 - 90. Humidity is about 60% inside the bins.

She's not breathing heavily, and her eyes and mouth look clean and clear. No open mouth breathing. Her scales and vent look clean and good.

My assumption is that she just ate more than she could really handle. She's never been breed, but she's about that size, it's about that time of year, and there's males in the room. It's understandable that she'd be trying to pack on the weight to try to prepare herself to breed, and wanted to eat as much as possible. So I think what happened was that a few days in, she realized she wasn't digesting her meal as well as she wanted to, and she got rid of half of it.

I can't explain why else she would regurge 1 rat, but not both. It looked less digested than I would expect after 2.5-3 days, so I think she decided that two was too many, and she should focus on just digesting one of them. My plan is to keep an eye on her and make sure she's staying healthy looking, and to offer her a small meal (perhaps a very small rat) in 2 weeks.

Apart from being pretty inactive, and staying tightly coiled over her hot spot, nothing else appears to be wrong with her. Does anyone have any ideas on this? Has anyone seen or heard of a snake regurgitating only 1 of a multi-rodent feeding? Does anyone agree or disagree with my assessment? Am I missing anything?