The Crested Black-tyrant is an inhabitant of cerrado and pastureland in Southern Brazil from Mato Grosso east to Bahia and south to Rio Grande do Sul and in Paraguay and Uruguay. As the name implies, the Crested Black-tyrant is large, glossy-black and conspicuously crested. Unlike most other members of the genus Knipolegus, both males and females are similarly black in color. The Crested Black-tyrant feeds mainly on insects which it catches making quick aerial sallies, but at times this flycatcher will feed on fruit. The Crested Black-tyrant is usually encountered in pairs.