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Additional Information:
The fly came from outside and bumped several times on to the window pane. I was in a hurry and therefore did not catch it. Coming back after 2 or 3 hours I found the fly dead on the floor. I assumed that it died because of the collisions.
Here is a picture of the fly.
Is it possible to answer the question: Are the larvae the "children" of the fly or was the fly killed by the larvae of another fly species?