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The German cockroach is much paler in colur than the Oriental and is typically a sandy, copper colour. The Oriental cockroach is dark brown to black in colour and very shiny. One other way to tell them apart is that the Oriental cannot fly or climb smooth surfaces, whereas the German can (in fact they’re very mobile generally and can even swim). Cockroaches are quite large insects and their size vares between 10mm-23mm in length. They have long antennae and two sets of wings.
Where they live
The German cockroach favours warm, damp environments, and heating systems in large buildings are a favorite. The Oriental cockroach is generally found indoors (mainly in heated buildings), although sometimes outdoors around dustbins etc.
Cockroaches are nocturnal and generally seen only at night. In daylight hours, they hide in cracks around areas like sinks, drains and cookers. If you suspect their presence, then one way to confirm it is to turn the lights on at night. You’ll then see them as they scuttle into dark areas of the room. If cockroaches are present in large numbers, they often leave an unpleasant almond-like smell, so this is another way to detect their presence.
Cockroaches can be a serious and dangerous pest as they can carry dysentry, gastro-enteritis, typhoid and food poisoning organisms. They spread germs from their body and from their droppings, and contamination can occur if they come directly into contact with foodstuffs.