Which two flies are known to overwinter in homes?

The cluster fly and face fly are indeed recognized for their ability to overwinter in homes. Cluster flies, which tend to congregate in large numbers, commonly seek out sheltered spots, such as attics or wall voids, to hibernate during the colder months. They become active when the weather warms up, which is why homeowners frequently notice them in their homes as the seasons change. Similarly, face flies are known to enter structures to escape the cold, where they can also survive the winter.

The other options consist of flies that typically do not overwinter in homes or have different life cycles that do not involve seeking shelter in human dwellings. For instance, house flies and fruit flies primarily reproduce in warmer conditions and are not known for wintering indoors. Stable flies, black flies, horse flies, and deer flies are also more active during warmer months and do not have the same overwintering behavior. This specific knowledge of the overwintering habits of flies is crucial for pest control operators seeking to manage infestations effectively during the winter months.