The horned curassow or southern helmeted curassow (Pauxi unicornis) is a species of bird in the Cracidae family found in humid tropical and subtropical forests. It was first described by Bond & Meyer de Schauensee from Bolivia in 1939, and further birds that were described by Weske & Terborgh from Peru in 1971 were thought to be a subspecies. However, the taxonomical position of this 1971 species or subspecies is unclear and further research is needed to clarify the position. The horned curassow as originally described is endemic to Bolivia. It is a large, predominantly black bird with a distinctive casque on its forehead. It is an uncommon bird with a limited range and is suffering from habitat loss, and the International Union for Conservation of Nature has rated its conservation status