What is a common indicator of a mouse infestation?

Gnaw marks on food packages are a well-known indicator of a mouse infestation because mice have continuously growing incisors that require them to gnaw on various materials to keep their teeth from getting too long. Food packages, which are often made from cardboard or plastic, provide an accessible target for their gnawing behavior. These marks indicate not only that mice are present but also that they are actively seeking out food sources in the area.

Other options may suggest different types of infestations or situations. For example, buzzing sounds are more associated with insects like bees or wasps, while webs in corners are typically linked to spider infestations. A foul odor might indicate a variety of issues, including the presence of dead animals, but it is less specific to mice compared to the distinct, identifiable gnaw marks they leave behind on food packaging. Therefore, the presence of gnaw marks is a clear sign that mice are invading a space, making it the strongest indicator of a mouse infestation.