What insect order constitutes the single largest category delivered to Willow Flycatcher nestlings?
Answer
Lepidoptera (Small Moths, Caterpillars)
Caterpillars, which belong to the order Lepidoptera, constitute the single largest category of food delivered to growing Willow Flycatcher nestlings based on frequency of delivery observed in studies tracking food brought to the nest. This preference is strongly linked to the developmental needs of the chicks, as these soft-bodied larvae are easier for the young birds to break down and digest compared to harder prey items. While flies (Diptera) are also a major component, the larvae stage of moths and butterflies is highlighted as the most numerous item provided by the parents during the peak demand phase of rearing the brood.
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