What is one key indicator of a significant pest population presence?

One key indicator of a significant pest population presence is the observation of visible droppings. The presence of droppings is often a clear sign that pests are actively inhabiting an area, as it indicates not only activity but also that these pests are feeding and moving about. Droppings can vary in appearance depending on the type of pest, making them a tangible and specific sign of infestation.

Other indicators, such as high feeding activity, can also point to a significant pest presence but may not always be as easily observed or directly linked to the number of pests present. Similarly, fewer sightings or an absence of pests would typically indicate the opposite of a significant pest population. Hence, visible droppings serve as a critical and direct indicator, providing tangible evidence of an infestation that warrants further investigation and control measures.