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Brontornis
''Brontornis'' was a genus of giant flightless predatory birds that lived in Patagonia.〔Alvarenga, Herculano M. F. & Höfling, Elizabeth (2003): ''Systematic revision of the Phorusrhacidae (Aves: Ralliformes)''. ''Papéis Avulsos de Zoologia'' 43(4): 55-91 (PDF fulltext )〕〔Moreno, Francisco P. & Mercerat, A. (1891): Catálogo de los pájaros fósiles de la República Argentina conservados en el Museo de La Plata. ''Anales del Museo de La Plata'' 1: 7-71.〕〔http://darrennaish.blogspot.com/2006/10/terror-birds.html〕〔http://darrennaish.blogspot.com/2006/11/more-on-phorusrhacids-biggest-fastest.html〕〔http://dml.cmnh.org/2000Mar/msg00218.html〕〔http://dml.cmnh.org/2000Mar/msg00099.html〕 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, and more precisely to the subfamily Brontornithinae, which contained extremely large and very heavyset forms.
==Description==
It is known from bones, mainly of the legs and feet but also portions of some skulls and backbone, found in several localities of Santa Cruz Province.
''B. burmeisteri'' was the second tallest species of phorusrhacid, with a height of around and the heaviest species of phorusrhacid with an estimated weight of (Alvarenga & Höfling, 2003), making it the third-heaviest bird ever according to current knowledge (after ''Aepyornis maximus'' and ''Dromornis stirtoni''), and the most massive land predator of its time and place. Due to its bulk, it probably had a lifestyle between an ambush predator and one that actively chased prey, pouncing on the latter from a hideout and bringing it down by sheer force of attack after a short chase. In attacking prey (but probably not necessarily in a defensive situation, as it was too slow-moving) it most likely was the dominant carnivore of Miocene Patagonia, being able to kill even large animals such as the elephant-like ''Astrapotherium'' and in the predatory role being on par with a pack of ''Thylacosmilus'' (metatherian sabre-tooth). It coexisted with some slightly smaller and more active phorusrhacids like ''Phorusrhacos'', but apparently became extinct before the appearance of the immense ''Argentavis'', the largest flying bird ever.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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