Which of the following can indicate a rodent infestation?

The presence of droppings or gnaw marks is a strong indicator of a rodent infestation. Rodents, such as rats and mice, are known for their habit of leaving droppings as they move around in search of food and nesting sites. These droppings can often be found in concentrated areas where they have been feeding or nesting. Additionally, gnaw marks on surfaces such as wood, plastic, or even electrical wires are a clear sign that rodents have been active in that location.

In contrast, while nests in trees might suggest the presence of some wildlife, they are not specifically indicative of a rodent problem, as various animals can build nests in trees. Overgrown vegetation and discolored leaves, although they could indicate other issues within an ecosystem, do not specifically signal rodent activity. Focus on droppings and gnaw marks as key signs for identifying a rodent infestation efficiently.