Did you know that a cockroach can stay for seven good days without a head?
Yes, those ‘filthy’ insects you hate seeing them around the house, moving around like shareholders in your own house appear to be ‘resistant’ to death.
Due to their open circulatory system, and the fact that they breathe through little holes in each of their body segments, they are not dependent on their head to breathe.
They only die after seven days due to thirst because they need a mouth to drink water. Now you know.