It's already been noted that some snakes get a bad reaction to ringneck snakes.

There have been a lot of cases of kingsnakes eating ringnecks... Then mysteriously dying..

And there are also many cases of ringnecks used as feeder food for kingsnakes.

Probably something to do with the musk. Who knows.
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Mike
KingPin Reptiles Inc.
www.kingpinreptiles.com