German Cockroaches and Oriental Cockroaches belong to the same family of roaches. However, the word "Cockroach" is now a term for all insects with six limbs starting from beetles to Bed Bugs. I will try to answer how to distinguish them most easily way. First of all we have to determine if it is an adult individual. Then the final stage of the German Cockroach measures a maximum of 1.7 cm, while the Oriental Cockroach measures from 1.7 cm up to 2.8 cm. In case of adults it is simple, German Cockroach The matter gets more complicated if we have individuals that hatched from eggs not so long ago, because the above mentioned features are formed in the final stages of nymphs before they become adults. However the occurrence of German Cockroaches and Oriental Cockroaches differs significantly. German Cockroach like living with people, warm apartments and kilograms of leftovers to eat, but Oriental Cockroaches prefer dark places like basements, basement, garbage dumps and dumpsters. We encounter German Cockroaches 90 percent of the time in apartment buildings. The big indicator is that if roaches are walking around the apartment during the daytime, it means that there are already hundreds or even thousands of them in our or neighboring apartment.