Brontornis

Brontornis is agenus of giant flightless terror birds that lived in Patagonia, Argentina.[1][2][3][4][5][6] The only species currently accepted as valid is B. burmeisteri. It has traditionally been placed in the family Phorusrhacidae, nicknamed "terror birds" for their large size and predatory lifestyle, more specifically the subfamily Brontornithinae, which contains the extremely large and heavy-set phorusrhacids. Fossils of the terror bird have been found in the Santa Cruz and Monte León Formations in Argentina.[7]