If a customer complains about small "fuzzy" insects coming from a floor or sink drain, what pest are they likely referring to?

The customer is likely referring to moth flies, commonly identified by their small size and fuzzy appearance. Moth flies, also known as drain flies, are typically found in moist, organic-rich environments, such as floor and sink drains. They breed in the buildup of organic material within drains and plumbing fixtures, giving them a direct connection to the areas the customer is observing them.

Moth flies have a distinctive fuzzy appearance due to the dense hair on their bodies and wings, which aligns with the description provided. Understanding the habits and characteristics of moth flies is crucial for pest control professionals when diagnosing and effectively managing infestations.

While drain flies might also be considered, the term 'moth flies' more specifically highlights their fuzzy appearance. The other insects listed do not fit the description as closely: fruit flies are more slender and often found around fermenting produce, house flies lack the fuzzy appearance and typically are not associated with drains.