It has spread throughout the world thanks to human transport, including long-distance transport by ship. Because it is small (about 12 mm long), this cockroach often is carried into homes in grocery bags and boxes. Three or more generations may occur yearly. The female produces the ootheca 3 days after mating and carries it for about 20 days. The German cockroach ( Blattella germanica), a common household pest, is light brown with two dark stripes on the prothoracic region. However, most species are not good fliers. The American cockroach has well-developed wings. During adult life, a period of about 1.5 years, the female deposits 50 or more oothecae, each containing about 16 eggs that hatch after 45 days. The American cockroach (species Periplaneta americana), a native of Africa and the Middle East, is 30 to 50 mm (up to about 2 inches) long, is reddish brown, and lives outdoors or in dark heated indoor areas (e.g., basements and furnace rooms). The diet of the roach, which includes both plant and animal products, ranges from food, paper, clothing, and books to dead insects, especially bedbugs. The insect damages more material than it consumes and emits a disagreeable odour. The cockroach prefers a warm, humid, dark environment and is usually found in tropical or other mild climates. The structure and large size (certain species have a wingspread of more than 12 cm ) of cockroaches have made them objects of interest in the biological laboratory. As their exoskeleton hardens, it turns brown in colour. After the female deposits an egg case, the soft white nymphs emerge. These are sometimes held protruding from her body or may be glued in protected areas. The female produces eggs in egg cases (called oothecae).
Male cockroaches usually have two pairs of wings, whereas females, in some species, are wingless or have vestigial wings. The head is bent downward, and the mouthparts point backward instead of forward or downward as is the case in most other insects. The cockroach is characterized by a flattened oval body, long threadlike antennae, and a shining black or brown leathery integument. The word cockroach is a corruption of the Spanish cucaracha.
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