In a rare and remarkable find, scientists in Argentina have uncovered a fossilized dinosaur egg that dates back an estimated 70 million years. Discovered in the remote Rio Negro region of Patagonia, the egg is drawing widespread attention for its extraordinary state of preservation, offering a rare window into the ancient world.
Roughly the size of a modern ostrich egg, the fossil appears to have belonged to a small meat-eating dinosaur known as Bonapartenykus, which once roamed the area during the Late Cretaceous period. Experts say eggs from carnivorous dinosaurs are particularly hard to come by, making this find especially significant.
The egg’s near-perfect condition has surprised many in the scientific community. Early reports suggest it may still hold traces of preserved biological material inside — a possibility that could open up new insights into how dinosaurs reproduced and developed before birth.
Unusual egg find from a rare dinosaur species in Patagonia, Argentina
Paleontologist Gonzalo Muñoz from the Argentine Museum of Natural Sciences said the egg is not only rare but could prove to be a key piece in understanding prehistoric life in South America. According to Muñoz, meat-eating dinosaurs were less common than plant-eaters, and their eggs were often fragile due to thinner shells. This made it difficult for them to survive the test of time.
This kind of preservation is incredibly uncommon, Muñoz explained. Most eggs from predators such as Bonapartenykus don’t survive this well, if at all.
A team of palaeontologists in Argentina has uncovered an extraordinary discovery — a dinosaur egg estimated to be around 70 million years old and in near-perfect condition…
— Archaeo – Histories (@archeohistories) October 23, 2025
The fossilized egg, believed to date back to the Cretaceous period, was found in Patagonia and is so… pic.twitter.com/ZgTu00qjg9
The egg was discovered as part of an ongoing research project known as Cretaceous Expedition I, which continues to explore the fossil-rich terrain of Patagonia. Alongside the egg, researchers also found the fossilized remains of small mammals and snakes — a strong indication that the area once served as a breeding ground for several prehistoric species.
The fossil has been moved to a laboratory for further study. Scientists plan to use advanced imaging techniques to examine the interior of the egg without damaging it. If embryonic tissue is present, it would mark one of the most important discoveries of its kind in South American paleontology.
Footage of the moment the egg was found has also drawn attention on social media. In a video shared online, expedition leader Federico Agnolin is seen reacting with astonishment as he spots the egg lying on the surface of the arid ground.
"Nunca vimos un huevo tan bien preservado"
Los investigadores del Laboratorio de Anatomía Comparada y Evolución de los Vertebrados del CONICET encontraron un "huevo de un dinosaurio carnívoro" en un yacimiento de Río Negro y lo mostraron en el streaming de la expedición. pic.twitter.com/Gm8My8gSWw
— Corta (@somoscorta) October 8, 2025
The discovery has sparked interest beyond the scientific community, with many calling it one of the most complete examples ever found in the region. The team reported that several eggs were located in a small cluster, suggesting the possibility of a nesting site.