A fly that often enters buildings in large numbers during the autumn while looking for a place to overwinter.
- Pollenia rudis (family Calliphoridae), whose larvae parasitize earthworms, and the smaller Thaumatomyia notata (family Chloropidae).
- Bluebottles and cluster flies are disgusting little creatures, feeding off rotting food and excrement.
- Face flies and two or three species of cluster flies are often found in large clusters in the same overwintering site.
- Of course, spring is a good time to find earthworms, so the cluster fly is active during this season.
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Syllabification: clus·ter fly
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