Andalgalornis steulleti
Andalgalornis was a genus of flightless predatory birds of the family Phorusrhacidae (often called "terror birds") that lived in Argentina during late Miocene - early Pliocene." (Wikipedia)
References: http://www.oucom.ohiou.edu/dbms-witmer/terror_birds_PLoS-ONE_media.htm
Skull credit: Degrange FJ, Tambussi CP, Moreno K, Witmer LM, Wroe S (2010) Mechanical Analysis of Feeding Behavior in the Extinct "Terror Bird" Andalgalornis steulleti (Gruiformes: Phorusrhacidae). PLoS ONE 5(8): http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0011856#pone-0011856-g001
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