What do rodent sebum stains look like?

Sebum stains are used to identify mice activity. Sebum is oil from the sebaceous glands. Think about what is know as “ring around the collar.” That is a discoloration to a shirt collar from sebum. Sebum from rodent fur is left on runways. The more the runway is used, the more sebum builds up. This is

known as a rub mark. Use rub marks to effectively place your rodent traps or bait stations. Finally, use rub marks to identify entry points from the outside.