1.   A few cluster flies found the warm logs and sat on them.

2.   Cluster flies are bristly gray insects, about five times bigger than the ordinary housefly, Musca domestica.

3.   Few people realize where the cluster fly comes from.

4.   And, as many a dismayed homeowner has discovered, cluster flies often come indoors in the fall, then spend winter as adults in nooks inaccessible to swatters.

5.   Q. What are cluster flies and how can you get rid of them?

6.   The massive apple-green velvet piece acted like a magnet for enervated visitors, who dropped like cluster flies onto the velvet coils.

7.   These are cluster flies, so named for their clustering habits, and do not carry the diseases that house flies do.