Cockroaches can live for 30 days after their head has been cut off.

Saturday, January 22, 2011

While it is more average for a cockroach to only live headless for 9 days or so, they can live for extremely long amounts of time. Cockroaches breathe through spiracles, which deliver air to each cell of the body through a set of tubes called tracheae. The brain does not control the breathing through the spiracles. So they don't need a head to breathe! 

Also, the cockroach does not have blood pressure the way a mammal does, so cutting off the head does not lead to uncontrolled bleeding. What about food? They need much less food - single meal is enough to last them a whole month! This ability isn't all its cracked up to be, however - without a head, the cockroach would just sit around without doing much.

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