The yellow-headed caracara (Daptrius chimachima) is a new-world bird of prey in the family Falconidae, of the Falconiformes order (true falcons, caracaras and their kin). It can be found in North America and South America, from Nicaragua to Uruguay.
The yellow-headed caracara was formally described in 1816 by French ornithologist Louis Vieillot with the binomial name Polyborus chimachima. Vieillot based his account on the "Chimachima" from Paraguay that had been described by the Spanish naturalist Félix de Azara in 1802. The specific epithet is from a local Argentinian onomatopoeia word "Chimachima" for a caracara. The yellow-headed caracara was formerly placed with the chimango caracara in the genus Milvago. Molecular genetic studies found that Milvago was polyphyletic with the chimango caracara sister to the genus Phalcoboenus and the yellow-headed caracara sister to species in the genus Daptrius. As the genetic divergence was relatively shallow, the polyphyly was resolved by expanding the genus Daptrius to include the two other genera.
Two subspecies are recognised: