Argentavis magnificens

Overview

Argentavis magnificens is a large fossil teratorn bird known from Argentina. Several bones of the head, wings, and legs were recorded together. Comparing the surviving parts with related birds helps us understand the body of this large bird.^[1]

Key facts

Two museum numbers do not necessarily mean two fossil individuals. MLP65-VII-29-49 is recorded as the original associated partial skeleton, while LACM120074 is its replica. This is an example of a single fossil connecting with another collection and further research through replication.^[1]

Time and place

It was described in research on Huayquerian-age material from present-day Argentina. The registered fossil-bearing strata are summarized within a broad time window of roughly 8–5 million years ago, around the Late Miocene to Early Pliocene. This material provides a basis for comparing large fossil birds of South America.^[1][2]

The time range describes source context, not the complete duration of this species.

Size, form and skeleton

A partial skull and quadrate, shoulder skeleton, and several portions of the wings and hind limbs were described together. The skull is described as broader and more vertically flattened than that of the bird used for comparison. Examining cranial and limb bones region by region allows the body's arrangement to be compared.^[1]

A 2022 study analyzing the flight of Argentavis used a model of a bird weighing 70 kg. This value was used to calculate how the giant bird flew, based on body size reconstructed from fossils.^[3]

Habitat and reproduction

The bones of the shoulder, wings, and legs offer one starting point for exploring the life of a large bird. A 1980 study compared Argentavis with corresponding skeletal parts of other teratorns. The legs supporting the body and the bones forming the wings each raise different questions.^[1]

Fossil discovery

A 1980 study described an associated partial skeleton from Argentina as a new teratorn. It recorded the surviving portions of the head, shoulders, wings, and hind limbs together. A replica was also made, connecting material from this large bird with research and collection records.^[1]

References

1. 1980 study — Argentavis from Argentina
2. Paleobiology Database — Fossil-bearing strata of Argentavis
3. Goto et al. (2022) — Gliding performance of giant birds and pterosaurs
4. Florida Museum — Discovery and localities of Titanis walleri
5. Gould & Quitmyer (2005) — Bones and wings of Titanis

Research questions

How can an isolated wing bone of a large bird be connected with its whole body? Surviving parts are compared side by side with the same bones in related birds. Distinguishing preserved lengths from estimates of missing portions makes research into the form of large birds more concrete.^[1]

Observation

Move your gaze from the broad head to the shoulders and wings, then to the hind limbs. Considering the several fossilized regions separately helps explain how comparisons of a partial skeleton reveal the body of one animal.^[1]