Which of the following is a common sign of rodent infestation?

Droppings and gnaw marks are key indicators of rodent infestation. Rodents, such as mice and rats, frequently leave droppings in their nesting areas or along travel routes, making it easier to identify their presence. Additionally, they have a natural tendency to gnaw on various materials to keep their teeth trimmed, resulting in noticeable marks on wood, plastic, or even electrical wiring. The presence of these droppings and gnaw marks provides tangible and visible evidence of an active rodent problem, allowing for timely intervention and control measures.

In contrast, visible nests in trees typically suggest the presence of birds or larger animals rather than rodents. Uneven growth in plants can be attributed to various factors, including pests other than rodents, diseases, or environmental conditions. Unexplained odors in the fridge may indicate spoilage or problems with food storage and are not directly associated with rodent activity, making them less reliable signs of an infestation.