Which of the following is a sign of a potential bed bug infestation?

The presence of shed skins is a significant indicator of a potential bed bug infestation. Bed bugs undergo a series of molts as they grow from nymphs to adults. During this molting process, they shed their exoskeletons, leaving behind recognizable skins that can often be found near their hiding spots, such as in bed linens, mattress seams, or cracks in furniture. These shed skins are often translucent and may resemble the shape of a bed bug, making them an important sign to look for when trying to identify an infestation.

In contrast, frequent fly activity typically points to issues related to other pests or hygiene problems, while unusual bird droppings and visible mouse tracks signal infestations related to birds or rodents, respectively, and are not associated with bed bugs at all. Therefore, recognizing shed skins is vital for pest management professionals in diagnosing and confirming the presence of bed bugs in a household.