The answer to 'flea trails' is that flea trails are the visible paths or tracks left behind by fleas as they move across surfaces in your home. These trails are typically a sign of a flea infestation and indicate where the fleas are living and traveling.
Flea trails are often found on carpets, pet bedding, and along baseboards. They appear as small, dark lines or dots that can be followed to locate the fleas' hiding spots. Flea trails are usually accompanied by other signs of an infestation, such as seeing live fleas, finding flea dirt (flea feces), or noticing your pets scratching more than usual.