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Snakes eating themselves can be a sign of stress, but can also happen if your snake accidentally mistakes its tail for another snake. Always check the temperature of the enclosure, as an enclosure that's too hot is a common cause. Also check for other husbandry issues like a cage that's too small, or other things that may be causing stress to your snake Emotion: smile

Source: https://urbanreptiles.com/why-do-snakes-eat-themselves/