The family Vireonidae comprises small to medium-sized passerine birds commonly known as vireos, along with their relatives, including greenlets and shrike-vireos. These birds are primarily found in the Americas, ranging from North to South America, and inhabit forests, woodlands, and shrublands. Vireonids are insectivorous, feeding mainly on insects and spiders, though some species also consume fruits. They are generally small, stout birds with relatively short bills, often exhibiting subtle green, gray, or yellowish plumage that provides camouflage in foliage. Vireos are known for their persistent, melodious songs, which males use to defend territory and attract mates. The family plays an important ecological role in controlling insect populations and dispersing seeds in tropical and temperate ecosystems.