Ophiophagy is much more widespread than typically thought. Of course your kings, ringnecks, indigos etc practice it, but so do corns, garters, copperheads, hognose, bullsnakes etc. Often times these animals can be kept communally for years, and then an event like a fresh shed or parturition leads to a feeding response in one snake on another. Sometimes, the trigger isn't understood. It's a risk anyone takes with communal enclosures.

Ian