What common method is used to detect the presence of commensal rodents?

The method of using commercial black lights to detect the presence of commensal rodents is based on the behavioral and biological characteristics of these animals. Rodents, like mice and rats, often leave behind urine and droppings, which contain substances that can fluoresce under ultraviolet (UV) light. When a commercial black light is shone in an area suspected of rodent activity, the urine stains will glow, making it easier for pest control professionals to identify areas of high rodent activity.

This method is particularly effective because it can help locate hidden infestations that may not be immediately visible to the naked eye. Detecting these indicators allows for a more targeted approach when implementing control measures, leading to increased effectiveness in managing rodent populations.

Other methods listed, while potentially useful in different contexts, do not specifically leverage the unique properties of rodent-related waste products for detection. Sound traps and glue boards focus more on trapping or capturing rodents rather than detection. Heat cameras can show the warmth emitted by animals but do not specifically differentiate between species or target rodent activity effectively like black lights do.