I learned quite a bit about cockroaches in developing this project (actually more than I wanted to know).
Cockroaches can pick up disease-causing bacteria, such as Salmonella, on their legs, and later deposit them on foods and cause food poisoning or infection if they walk on the food.
American cockroach nymphs are capable of limb regeneration and have been used as an ingredient in traditional Chinese medicine. In China, an ethanol extract of the American cockroach, Kāngfùxīn Yè (康复新液), is prescribed for wound healing and tissue repair.
They are fast… in an experiment, an American cockroach registered a record speed of 5.4 km/h (3.4 mph), about 50 body lengths per second, which would be comparable to a human running at 330 km/h (210 mph). American cockroaches are omnivorous and opportunistic feeders that eat materials such as cheese, sweets, beer, tea, leather, bakery products, starch in book bindings, manuscripts, glue, hair, flakes of dried skin, dead animals, plant materials, soiled clothing, and glossy paper with starch sizing. They are particularly fond of fermenting foods. They have also been observed to feed upon dead or wounded cockroaches of their own or other species.