The Madagascar Hissing Cockroach can have a length of up to 3 inches. Their coloration is dark brown, and the body is segmented. This species has special breathing pores along the sides of its body. This hissing sound is caused by air being expelled through these pores, and can be heard up to 12 feet away. The hissing sound is produced by males courting or battling for territory, and also gently by a female becoming receptive to a mate.
The Madagascan cockroaches are so fastidious that they seem unlikely to ever invade human quarters. Entomologists keep them as pets, wondering if anything could be added to their diet to induce them to grow wings. Well-fed adults have already developed short, blunt horns, which seems unusual for insects so eager to avoid confrontation. They have biting and chewing mouth parts, and teeth in their gizzard.
No cockroach species are parasitic or poisonous. Fossil cockroaches have been found dating back to 280-350 million years ago. They have persisted because of their flexible eating habits, their ability to adapt, their flat body which enables them to hide in narrow places, and the strong muscles in their legs which enable them to run rapidly.