The answer to 'bee trails' is that bee trails are a sign of a bee infestation in or around your home. Bees leave scent trails to mark the path from their hive to food sources, and these trails can often be seen on walls, windows, or other surfaces. Common causes include a beehive or nest located nearby, often in the walls, attic, or other hidden areas of the home.
Symptoms of bee trails include seeing a line of bees repeatedly traveling along the same path, as well as seeing the trails themselves on surfaces. Solutions depend on the severity of the infestation, but may include sealing entry points, removing the hive or nest, and using bee-repelling sprays or traps. For larger infestations or hard-to-reach nests, it's best to call a professional pest control company for safe and effective removal.