Large groups of eggs representing the oviposition of a number of females of Lucilia cuprina are frequently found on fleece preparations. Females were shown to have a preference for ovipositing in cavities in the fleece, especially those near the moist cotton-wool plugs. The cavities are primarily attractive as places of high humidity and low illuminance. Of secondary importance is the preference of females for laying at places where other females are already ovipositing.