Vireos are small to medium-sized birds belonging to the family Vireonidae. They are primarily found in the Americas, with many species residing in forests, woodlands, and shrubby areas. Vireos are known for their distinctive olive-green or gray plumage and often have a subtle, melodic song. These birds primarily feed on insects and fruits, making them important for pest control and seed dispersal. Vireos are also recognized for their unique nesting habits, typically building cup-shaped nests in trees or shrubs. Some common species include the Red-eyed Vireo and the Warbling Vireo.