Blattella is a genus of small cockroaches commonly known as the German cockroach. These insects are typically light brown or tan, with two dark stripes running down their backs. They are about 1.1 to 1.6 centimeters long and are known for their rapid reproduction, making them a common pest in homes and restaurants. Blattella species thrive in warm, humid environments and are often found in kitchens and bathrooms. They are nocturnal and prefer to hide in cracks and crevices during the day. Effective control measures include maintaining cleanliness, sealing entry points, and using insecticides when necessary.