My friend Frank Romboy used to make Hisser Huts that made it possible to keep much larger numbers of animals in a cage than normal. Far superior to egg carton and ideal for certain genera like Gromphadorhina and Opisthoplatia. Females of these species are less likely to abort or hold eggcases when they aren't stressed. The huts are made of pieces of masonite with bolts, nuts and washers and can be made with any number of levels and with narrow levels to house young hissers. You can make your own hut for specific cages and specific sized roaches. They are excellent for some species with the only drawback being some difficulty getting them out (primarily just the narrow levels with youngsters). They are fastened with wingnuts so they can be taken apart. They stand up to time though plastic or brass hardware may be a better choice.
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