The Red-eyed Vireo, scientifically known as Vireo olivaceus, is native to North America and parts of South America. It is primarily distributed across Canada and the eastern United States during the breeding season. In the winter, it migrates to South America, particularly the Amazon Basin, encompassing countries like Brazil, Ecuador, and Peru.

The Red-eyed Vireo typically inhabits deciduous and mixed forests during the breeding season. It is found in areas with dense foliage, particularly favoring mature woodlands with ample undergrowth. During migration and in its wintering grounds, this species adapts to various forest types, including tropical rainforests and woodlands.

Vireo olivaceus primarily feeds on insects, which it gleans from leaves and branches, making it an important insectivore within its ecosystem. It plays a role in controlling insect populations. Additionally, during migration and wintering periods, it supplements its diet with a significant amount of fruit, aiding in seed dispersal.