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How big are newborn hisser nymphs?

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I can't seem to find an answer anywhere oddly enough, but how big are the nymphs of Gromphadorhina protentosa/oblongata? I have hybrid hissers and I'd like to know if the ventilation holes in my container are escape proof.


I recently got L. verrucosa (just a bit more than half the size of my hissers) nymphs from the females and they are ridiculously tiny, but they can't climb smooth surfaces so I don't worry about them. 

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I've never kept Hissers personally (though hope to do so soon), so take my answer with a grain of salt. However, I found some answers online. According to this source, they start at 1/4 of an inch, but according to this other source, it's 1/2 of an inch. Hopefully somebody with more experience with Hissers can give you better info, since there seems to be a bit of contradictory info online. 

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Most of my hisser sp. Seem to be in between 1/4" and 1/2" . never really measured though so not for certain that's the case. 

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More important than their size is their ability to squeeze through really tight openings, 

so the lid of the box you keep the roaches inside should close absolute dense.

Or in the case of a glas terrarium there can be gaps, mostly between the door glasses or 

between front window and upper glass.


I had G.oblongonata in a big box with another big box above of it, usually there also

had been one or two plants on top of the upper box. 

I had perpetual problems with little nymphs who made it over the vaseline stripe and 

then squeezed through lid and box.


It is some years in the past that I cared for the big hisser species, but when I remember right 

the N1 had 9-10mm in body length.


Greetings, Marco

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