: The German cockroach is easily identified by two dark, longitudinal stripes on its pronotum (the shield-like structure behind the head).
: Their activity is controlled by an endogenous biological clock , making them most active at night when they forage for food and water in human shelters.
: Research has shown that reproduction and development are often "socially facilitated," meaning they grow faster and reproduce more effectively when in groups. Health Risks and Vector Potential
Blattella species are typically small, generally ranging from 10 to 15 mm in length.