Sebum trails are described as:

Sebum trails are described as:

• A. White chalk marks on walls
• B. Fresh footprints in dust
• C. Black oily smudge marks along well traveled paths
• D. Clear droppings

Answer: (C)

Sebum trails are the greasy, oily marks rodents leave as they rub along walls and surfaces while traveling. As mice or rats move along their usual runways, oil from their fur transfers to the surface, creating dark, black smudge lines in areas they repeatedly use. This visible trail helps identify active rodent paths even if there aren’t many droppings yet. White chalk marks on walls wouldn’t come from rodent oil, fresh footprints in dust would show discrete prints rather than a continuous smear, and clear droppings aren’t how rodents typically appear—droppings are dark and pellet-shaped, not clear.

Sebum trails are the greasy, oily marks rodents leave as they rub along walls and surfaces while traveling. As mice or rats move along their usual runways, oil from their fur transfers to the surface, creating dark, black smudge lines in areas they repeatedly use. This visible trail helps identify active rodent paths even if there aren’t many droppings yet.

White chalk marks on walls wouldn’t come from rodent oil, fresh footprints in dust would show discrete prints rather than a continuous smear, and clear droppings aren’t how rodents typically appear—droppings are dark and pellet-shaped, not clear.