Learn all bout German cockroaches how to prevent them this summer! Facts about German cockroaches The German cockroach grows up to 16mm in length, has a tan color with two horizontal black stripes across its exterior, and has a pair of wings that are rarely put to use as they prefer to use their legs to move about. Younger German cockroaches are near black in color but also have the two stripes across their bodies. These cockroaches are known for their ability to reproduce at an incredible rate. After mating, the female German cockroach lays 4-6 egg cases, with each of those casings containing about 30-40 eggs! The eggs hatch ...