One of the smaller species of cockroach at 13-16mm in length, German cockroaches love warm and well-hidden environments. They are often found in kitchens and transmit bacteria as they walk which makes for a very unhealthy combination. They have been linked to the transference of salmonella and E.coli.
German cockroaches leave droppings and empty egg cases. They also secrete odorous compounds that have been reported as a musty smell.