Phorusrhacos

Phorusrhacos is an extinct genus of large, flightless predatory birds from Miocene South America. Its massive hooked beak and powerful legs typify the group known as terror birds.

Terror birds: Terror birds are extinct, mostly large flightless predatory birds in the family Phorusrhacidae. Phorusrhacos is one of the best-known members of this broader family.
Fossil: A fossil is preserved evidence of past life, including bones, footprints, and traces of activity. Phorusrhacos is known chiefly from fossilized skeletal remains.
Florentino Ameghino: Florentino Ameghino was an Argentine paleontologist and naturalist who described many South American fossil species. Ameghino named Phorusrhacos from fossils found in Argentina.
Seriema: Seriemas are long-legged South American birds in the family Cariamidae, the closest living relatives of terror birds. Living seriemas provide a comparison for the evolutionary relationships of phorusrhacids.
Phorusrhacidae: Phorusrhacidae is an extinct family of flightless birds that dominated many South American terrestrial ecosystems. This family is the taxonomic group to which Phorusrhacos belongs.
Fossilization: Fossilization is the set of processes by which remains or traces become preserved in geological deposits. Preservation shaped which parts of Phorusrhacos are available for study.
Santa Cruz Formation: The Santa Cruz Formation is a fossil-rich Miocene geological formation in Patagonia, Argentina. Fossils assigned to Phorusrhacos are known from this formation.
Kelenken: Kelenken is an extinct genus of exceptionally large terror birds known from Miocene Patagonia. This related genus offers a comparison with another giant Patagonian phorusrhacid.
Cariamiformes: Cariamiformes is a bird order that includes living seriemas and extinct phorusrhacids. This order places Phorusrhacos among the broader relatives of modern seriemas.
Paleobiology: Paleobiology uses fossils to investigate the biology and ecology of ancient organisms. Its likely diet and movement are reconstructed from fossil evidence and comparisons.

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