Which of the following is NOT a typical sign of a cockroach presence?

Decreased food supply is considered a consequence of cockroach infestation rather than a direct sign of their presence. Cockroaches are scavengers that often consume various types of food, so their presence can lead to noticeable reductions in food supply due to their feeding habits. However, signs of an infestation typically include physical evidence such as fecal spotting, which consists of small dark dots left behind by the roaches; live roaches themselves, which are direct indicators of an active infestation; and visible nests, where cockroaches might congregate and reproduce. These signs can be easily identified during an inspection, while a decreased food supply may result from a variety of other factors and does not exclusively indicate a cockroach problem.