Regurgitation is always a sign that something is wrong so you need to quickly assess your situation. The first two suggestions were right on: separate the snakes (or find a new home for one of them), and, make sure you are providing the proper temps (I keep my WDB's at temps that range during the day from 75-78 deg F on the cool side to the mid 80's on the warm side and a basking area that reaches 90-92 deg F., night temps fall to the upper 70's/80 depending on the season). I would also recommend doing a fecal (and perhaps even a blood work up) to rule out parasites, paramoxyvirus, etc..
>>I agree. Housing more than one snake to a cage for any reason other than breeding is a bad idea. Only other thing I can think of beside meal size is ambient temperature. Too cool will often cause regurgitation.
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>> ~~Greg~~
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Rob Carmichael, Curator
The Wildlife Discovery Center at Elawa Farm
Lake Forest, IL