Temporal range: Late Miocene
Restoration of Andalgalornis steulleti
Reconstruction of Andalgalornis by John Conway
Scientific classification
Domain: Eukarya
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Cariamiformes
Family: Phorusrhacidae
Subfamily: Patagornithinae
Genus: Andalgalornis
Patterson and Kraglievich, 1960
Species: A. steulleti
Type species
Andalgalornis steulleti
Kraglievich, 1931

Andalgalornis steulleti is a species of terror bird that lived in Argentina from the Late Miocene epoch.


Although only known from some incomplete skeletons, the bones of Andalgalornis are at least complete enough to serve as the basis of size estimates, revealing a height of 1.4 meters (4.6 feet) and a weight of around 45 kilograms (100 lbs) based off of the bones of other phorusrhacids. This makes Andalgalornis particularly small among its kind, with a proportionally larger beak in comparison to the body size of other terror birds.


Not much is known about the lifestyle of Andalgalornis and how it interacted with other species in its region. Its relatively small size likely meant that it wasn't as dominant as a predator in comparison to other phorusrhacids, which would cause it to target smaller prey instead, using its long legs to outrun its prey and then repeatedly slamming said prey with its large pointed beak, swallowing it after knocking it unconscious, much like what modern-day seriemas (the closest living relatives of terror birds) do. When hunting larger prey, it may have used a hit-and-run tactic to slowly cripple its prey while dodging deadly counterattacks with its beak, targeting the prey's critical areas.

In popular culture[]

  • Andalgalornis appeared in the documentary series Paleoworld.