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

Holes in walls are a classic indicator of a rodent infestation. Rodents, such as mice and rats, often create entry points into structures by gnawing through materials like drywall, wood, or even insulation. These holes can vary in size, but they typically indicate that rodents are present or have been active in the area. Additionally, rodents tend to create nests and burrows, which can further lead to visible signs of damage.

Yellowing leaves may suggest issues related to plant health or pests, but they are not indicative of a rodent problem. Burnt electrical outlets point to electrical issues rather than a rodent presence, as rodents do not directly cause electrical problems in that manner. Puddles on the floor could indicate plumbing leaks or condensation issues but are not a sign specific to rodent activity. Thus, the evidence of holes provides clear and direct correlation to rodent behavior and presence in a given environment.