Or is that just the name they gave them?
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Yep. But I don't think it comes from their mouth. It actually happens because they push gas through small pores in their exo-skeleton or skin. They can hiss for three reasons to attract mates, to let everyone know they are annoyed or to warn off other cockroaches.
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No
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Yes..they use there two front legs..to scare bigger prey away..which makes a hissing sound
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Yeah they really do... ew.