If the size wasn't the problem than what is?I agree with Eric. We simply do not know the cause for the regurgitation at this point so we must take every precaution to stop it from happening a second time, because if your snake regurgitates again a second time it might be fatal. Regurgitation has very negative effects on snakes, it makes them really ill and very stressed, so much that they will be too weak to eat the next time in some cases which is why its fatal sometimes. But right now I can imagine your snake is very stressed out, so handling before he/she calms down is not recommended at all, it will only do more damage. Leave the snake alone for 2 weeks and then offer food , if all precautions are taken everything should go well. Just make sure husbandry is spot on. Next time when feeding as well like I said, minimize ANY stress the snake might have before and after eating, so handling a day before eating is a not recommended and leave the snake to properly digest for 2 days after that , because if you fiddle around with it before then, it gets stressed and will regurgitate. Also if you are feeding frozen/thawed, make sure you completely defrost and warm up that prey item, if there are any ice particles left within the prey, this could also cause regurgitation, I usually blow dry the prey item before hand.
But the size of the prey shouldn't cause this really. If the snake was able to swallow it down, then its the size was no problem. Snake's will know if the prey item is too big and wont even attempt swallowing if they know they will only regurgitate it. Though I must admit in some cases some snakes are dumb enough to try it and they actually "rip" open, its pretty gruesome. But I dont think the size of the prey item was the cause.
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