Males typically produce two types of signals, a calling sound and a courtship sound. Male Madagascar hissing cockroaches produces acoustic sounds or hissing during courtship interactions with females. ( Fraser and Nelson, 1984 Guthrie and Tindall, 1968) Nymphs molt their exoskeleton six times as they grow to adulthood, a process that usually takes 6-7 months. They hatch from eggs as nymphs, which are quite similar to adults in general structure, but lack reproductive organs. Madagascar hissing cockroachs have an incomplete or partial metamorphosis. ( Clark and Moore, 1995a Copeland, 2003 Guthrie and Tindall, 1968 Milius, 2002 Miller, 1977) Gromphadorhina portentosa is one of the largest species of the cockroaches in the world, adults are 5.1 to 10.2 cm long, with males growing larger than females. Males possess a pair of large bumps or tubercles behind their head, these structures are much smaller in females. They have pads and hooks on their feet that allow them to climb smooth surfaces. Their exoskeleton is dark, from mahogany brown to black, and very thick, hard, and waxy. Unlike many cockroach species, they do not possess wings. Like most insects, Gromphadorhina portentosa has a head, thorax, abdomen, and 6 legs. ( Copeland, 2003 Ryan, et al., 1993 Yoder and Grojean, 1997) They tend to live in the dry litter on the forest floor. Gromphadorhina portentosa is primarily found in the tropical lowland rainforests of Madagascar. ( Guthrie and Tindall, 1968 Yoder and Grojean, 1997) Gromphadorhina portentosa, the Madagascar hissing cockroach, occurs only on the the island of Madagascar.
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