Blunt trauma to the everywhere will kill anything.
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Because your putting pressure on them. And when the pressure is big, their skeleton collapses crushing their internal organs. But it works even when you dont smash them too. All you have to do is get a tissue and squish. They're dead now!
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Becuase your smashing them......
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if your intention is to kill them, smashing them will generally work. this is such a funny question!