German cockroaches are the most common cockroach species are found in households. German cockroaches undergo in three distinct life phases: egg, nymph and adult. Their entire life cycle spans roughly 100 days, although this is dependent on factors such as temperature, diet and injuries.
German cockroaches breed constantly. In a lifetime, a female cockroach has the capable of producing up to one million eggs. Populations grow very quickly in optimal conditions. A classic thriving population is comprised of 75 per cent nymphs and 25 per cent adult roaches.
Unlike other cockroach species, the female cockroach carries the oothecae attached to her abdomen until they hatch. Nymphs break free from their egg cases through concerted effort and remain close jointly after hatching. They undergo six or seven nymphal stages, called as instars, before emerging as winged adults capable of reproduction.
Adult cockroaches are nocturnal insects that hide during the day and scavenge at night. Despite with their fully developed wings, German cockroaches very rarely fly.