Which of the following is a common indication of a mouse infestation?

Chew marks on furniture are a distinct sign of a mouse infestation as these pests have strong, continuously growing incisors that require them to gnaw on various materials to keep their teeth trimmed. Mice will chew on wood, plastic, and other surfaces in their environment, often leaving noticeable marks. This behavior is not just limited to furniture; they may also create damage to food packages, wires, and walls, indicating their presence and activity in a given area.

Visible nests made of leaves, while they might indicate the presence of outdoor rodents or certain mammals, are not typically associated with mice, which often use materials like shredded paper, fabric, or insulation for nesting. Fresh mud on surfaces is more related to burrowing animals and does not reflect mouse activity. Similarly, while stale odors can potentially indicate a rodent problem, they are not as directly observable or reliable as the physical evidence of chew marks specifically linked to mice.