Original: It was nicknamed the '' Terror Bird '' for obvious reasons : it was one of the largest carnivorous birds to have ever existed , along with Titanis , Kelenken and Brontornis , and its rudimentary wings formed arm-like structures with claws shaped like a meat hook for tackling prey , which was then killed with the massive beak .
Simplified: Papéis Avulsos de Zoologia 43 : 55-91 PDF fulltext It was nicknamed the '' Terror Bird '' for obvious reasons : it was one of the largest carnivorous birds ever to have existed , along with Titanis , Kelenken and Brontornis .