The answer to 'why is my rat trails' is that rat droppings, urine trails, and oily rub marks left behind as rats travel along the same paths are common signs of a rat infestation in your home. Rats are nocturnal and create these trails as they repeatedly use the same routes to access food, water, and nesting areas. Seeing these trails indicates you likely have an active rat problem that needs to be addressed.
Rat trails are a clear sign that rats have infested your home and are using the same routes repeatedly. This can happen if rats have found an entry point into your home and are accessing food sources, water, or nesting areas through the same paths. The trails are a result of the oils from their fur and the dirt and debris they pick up as they travel along the same routes.