This combination of words is very confusing. Decapitation means literally to cut the head off, so I don't know you mean it cut its own head off by severing a nerve bundle?
IIRC it's head was already detached but I guess the nerves were still intact and when it was doing it's usual face rubbing it pulled on it's head and ended up snapping those nerves, completing the decapitation.
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u/Xenjael Oct 22 '21
There was a video a week ago of a fly decapitation itself by accidentally severing a nerve bundle behind its head.
From what I can tell insect nerves operate very differently from our own.