Argentavis
Extinct giant teratorn, among the largest flying birds known.
Argentavis is an extinct genus of teratornithid known from three sites in the Epecuén and Andalhualá Formations in central and northwestern Argentina dating to the Late Miocene (Huayquerian). The type and only known species, A. magnificens, is sometimes called the giant teratorn.
- field
- Paleontology
- known_for
- Among the largest flying birds, heaviest flying bird known
- wingspan
- 5–6 m (16–20 ft)
- time_period
- Late Miocene (Huayquerian)
- location
- Argentina
Lore & Background
The first remains of Argentavis were found during an expedition by the Museo de La Plata, roughly 15 km south of Hidalgo station, at the Salinas Grandes de Hidalgo locality in the Huayquerian Epecuén (now Cerro Azul) Formation of La Pampa Province, Argentina, by Rosendo Pascual and Eduardo Tonni. This material consisted of an associated partial skeleton with portions of the skull, right quadrate and parts of the legs and arms. The material was then brought to the Museo de La Plata and housed under specimen number MLP 65-VII-29-49. The generic name Argentavis comes from the Latin 'argentum', meaning silver, and 'avis', meaning bird, in reference to Argentina. The specific name magnificens means magnificent.
Reader's Guide
Argentavis is significant as one of the largest flying birds ever, with a wingspan of 5–6 m and a weight up to 72 kg, making it the heaviest known flying bird. Its discovery in Argentina expanded the known range of teratornithids beyond North America, and it is the second-oldest taxon in the family, suggesting a South American origin for the group. The holotype specimen, though severely fractured, provided enough cranial and quadrate evidence to establish a new genus and species. Later specimens from the Andalhualá Formation refined the age estimate to between 6.02 and 6.68 million years ago. The classification of Argentavis within Teratornithidae has been debated, with some suggesting it might be a subfamily of Vulturidae, but it remains at familial rank. Its legacy lies in illustrating the extreme size limits of flight in birds and the evolutionary history of large raptors in the Americas.
Did You Know?
- Argentavis is the heaviest flying bird known, weighing up to 70–72 kg.
- Its wingspan of 5–6 m is only surpassed by Pelagornis sandersi.
- The holotype specimen was found in the Epecuén Formation of La Pampa Province, Argentina.
Frequently Asked Questions
What is Argentavis?
Argentavis is an extinct genus of giant teratorn from South America, known from a single species called A. magnificens. It ranks among the largest birds ever to achieve powered flight.
How big was Argentavis?
The bird had an estimated wingspan of roughly 5 to 6 meters (about 16 to 20 feet), making it one of the heaviest flying birds known from the fossil record.
Where and when did Argentavis live?
Fossils have been recovered from the Epecuén and Andalhualá Formations in central and northwestern Argentina, placing the animal in the Late Miocene, specifically the Huayquerian age.
How is Argentavis related to modern birds?
It belongs to the teratornithid family, a group of large soaring birds distantly related to modern vultures and condors. No living species share its exact lineage, as the genus is entirely extinct.
Why is Argentavis important to paleontology?
It provides one of the best examples of how large a bird can grow while still being capable of sustained flight. Its fossils, drawn from three separate Argentine sites, help researchers reconstruct the ecology of Late Miocene South American grasslands.
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