An illustration depicts how *Vegavis iaai* might have appeared. CNN
Scientists have discovered a nearly complete skull fossil in Antarctica, revealing the oldest known modern bird. The fossil, dating back 68 million years, belonged to Vegavis iaai, a duck-sized bird closely related to today’s waterfowl that live near lakes and oceans.
This prehistoric bird lived at the end of the Cretaceous period, a time when Tyrannosaurus rex roamed North America and just before an asteroid impact wiped out the dinosaurs. Unlike many ancient birds with toothed beaks and long tails, Vegavis had features that made it more recognizable as a modern bird.
Christopher Torres, a biology professor and lead author of the study, explained that Vegavis was a diving bird, using its legs to propel itself underwater in search of fish. The fossilized skull revealed strong jaw muscles that helped it snap its beak shut quickly—similar to how modern loons and grebes catch their prey.
Although Vegavis was first identified 20 years ago, scientists were unsure if it belonged to the same group as today’s birds. Previously, most modern-looking bird fossils were found in rocks dating to after the mass extinction event 66 million years ago. Many researchers believed that today’s birds evolved only after dinosaurs disappeared.
A key reason for past skepticism was that earlier Vegavis fossils lacked a skull, making it hard to confirm whether it was truly a modern bird. According to study coauthor Patrick O’Connor, a professor at Ohio University, skulls are essential in identifying modern bird traits, such as toothless beaks and specialized bone structures.
The newly examined fossil was collected during a 2011 Antarctic expedition and was preserved in rock layers dating between 68.4 and 69.2 million years ago. Scientists confirmed that the skull had all the characteristics of modern birds, including a beak without teeth.
“This fossil proves that Vegavis was undoubtedly a modern bird, settling debates from the past,” said paleontologist Juan Benito Moreno, who was not part of the study but has worked on other fossil bird discoveries. He noted that the skull showed surprising adaptations for diving and fish-eating, more specialized than previously thought.
Surviving Mass Extinction?
By scanning the fossil using 3D imaging, researchers reconstructed the brain structure of Vegavis, confirming that it fits within the group that includes all modern birds. According to O’Connor, this makes it "the earliest known member of the 11,000 bird species we see today."
Despite its similarities to present-day waterfowl, Vegavis also had unique traits. Its slender, pointed beak with powerful jaw muscles was more like diving birds than typical ducks.
Antarctica during the Cretaceous period was much different from today. It had forests and a cool, temperate climate. Scientists believe Vegavis lived in a coastal environment, diving for fish near the shore.
Torres, who conducted the study at Ohio University, said the discovery of Vegavis along with another early bird species (Conflicto antarcticus) provides insight into how some animals survived the mass extinction. Understanding why certain species endured while others vanished could help scientists learn more about survival after global catastrophes.
