What insect group makes up nearly one-third of the White-Eyed Vireo's summer diet while nesting in the eastern United States?
Answer
Caterpillars, moths, and butterflies combined.
The core sustenance for the White-Eyed Vireo during the warmer months, especially when actively nesting and raising young throughout the eastern United States, centers on small invertebrates. Among these arthropods, soft-bodied larvae are paramount. Specifically, caterpillars represent a highly important food source. When considering the larger order of Lepidoptera, caterpillars, moths, and butterflies, when taken together, constitute nearly one-third of the vireo's total dietary intake during the peak breeding season. This heavy reliance on these specific larval forms highlights the intense nutritional demands associated with producing energy for reproduction and feeding offspring.

Related Questions
What insect group makes up nearly one-third of the White-Eyed Vireo's summer diet while nesting in the eastern United States?How is the foraging movement style of the White-Eyed Vireo described in contrast to warblers?What specific technique does the White-Eyed Vireo employ when capturing a larger or more awkward piece of prey?Why does the diet of the White-Eyed Vireo shift to incorporate more fruit as the weather cools and migration nears?Which specific berries are listed as dietary components for the White-Eyed Vireo during the fall and winter migration period?What types of dense, low cover are essential habitats that support the White-Eyed Vireo's active foraging style?What key difference exists in eye appearance between a mature White-Eyed Vireo and its young juveniles?Which two specific fruits found in the non-breeding range might White-Eyed Vireos consume in the southeastern U.S. or Central America?During the nesting period, why is locating active insect populations in the shrub layer the key strategy for observing the White-Eyed Vireo?What evidence suggests the White-Eyed Vireo acts as an opportunistic feeder within its dense shrubbery environment?