Definition of cluster fly in English:

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cluster fly

noun

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)
Example sentences
  • 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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