Common types of cockroaches in Hong Kong include Periplaneta Americana (American Cockroach), Periplaneta australiasiae (Australian Cockroach) and Blattella germanica (German Cockroach). Of these three species, the one that has the greatest potential for becoming persistent and troublesome is the German cockroach, which prefers indoor locations.
Cockroaches are medium-sized to large insects in the order Dictyoptera (formerly Orthoptera). They are broad, flattened insects with long antennae and a prominent, shield-shaped section behind the head called a pronotum. Adult cockroaches have membranous wings. Immature cockroaches (nymphs) look like adults, but are smaller and do not have wings.