The rocks surrounding Egypt’s Great Sphinx have preserved far more than traces of ancient human civilization. Scientists have now identified an extinct crocodilian from fossils found in the very same geological formation that supplied limestone for the famous monument.
The animal has been named Herugavialis cairensis, and researchers say it represents a previously unrecognized branch of the ancient gavial family.
The discovery offers a glimpse into what northern Egypt looked like tens of millions of years before humans built the pyramids and carved the Sphinx.
A crocodilian from 45 million years ago
The fossil comes from Egypt’s Mokattam Formation, a rock formation dating to roughly 45 million years ago.
At that time, the landscape was dramatically different from modern Egypt. The region was influenced by the ancient Tethys Ocean, and coastal waters covered parts of what is now northern Africa.
The fossil itself is a remarkably preserved skull, although the end of the animal's long snout is missing.
That missing piece creates an unusual connection with the Great Sphinx. The enormous statue at Giza is also famously missing the tip of its nose.
The similarity is purely coincidental, but it helped inspire the researchers when they selected the fossil animal's scientific name.
Scientists realized the fossil had been misidentified
The crocodilian fossil was not newly discovered in the traditional sense.
A skull from the area had been collected decades ago and was originally classified as belonging to Tomistoma, a group commonly associated with the modern false gharial.
However, advances in paleontological research have allowed scientists to take a much closer look at fossils that were studied many years ago.
Researchers revisited the Egyptian specimen and carried out detailed comparisons with both living and extinct crocodilians.
They also used modern imaging techniques to examine structures inside the skull, including the braincase and nasal passages.
These analyses revealed characteristics that did not fit the previous classification.
Instead, the researchers concluded that the animal belonged to a distinct branch of the gavial family tree.
Meet Herugavialis cairensis
The newly recognized animal was given the scientific name Herugavialis cairensis.
The name refers to Heru, an ancient Egyptian god associated with Horus, as well as Cairo, the city near where the fossil was found.
Researchers also saw an amusing coincidence in the fossil's condition: Herugavialis is missing the end of its snout, while the Great Sphinx is famous for its missing nose.
But beyond the unusual connection to the monument, the fossil has much greater scientific importance.
It provides evidence that ancient gavial-like crocodilians were more diverse than scientists previously understood.
Ancient gavials were not limited to rivers
Modern gavials are specialized aquatic reptiles with extremely long and narrow snouts.
The living gharial is found primarily on the Indian subcontinent, while the false gharial lives in parts of Southeast Asia.
Both are adapted to freshwater environments.
Their ancient relatives, however, appear to have occupied a much wider range of habitats.
Fossil evidence indicates that extinct gavial-like crocodilians once lived in different parts of the world and, in some cases, inhabited shallow marine and coastal environments.
Herugavialis appears to have been one of these ancient coastal predators.
Scientists believe it lived in the waters that covered parts of northern Egypt when the Tethys Ocean was present in the region.
A very different Egypt
It can be difficult to imagine Egypt as a place where crocodilian predators hunted in coastal waters.
Today, the country is dominated by desert, while the Nile is the major freshwater system running through the landscape.
Around 45 million years ago, however, northern Egypt was part of a very different environment.
Marine and coastal ecosystems supported a variety of animals, including fish and other reptiles.
The discovery of Herugavialis adds another species to the picture of this ancient ecosystem.
It also demonstrates how dramatically environments can change over geological time.
A location that is now famous for monumental architecture was once part of a coastal world inhabited by prehistoric animals.
More than one crocodilian lived in the region
Herugavialis was apparently not the only crocodilian living in ancient Egypt.
Researchers say other gavial-like crocodilians have also been identified from the broader region and geological record.
This suggests that crocodilian diversity in the ancient Mediterranean and surrounding areas was considerably greater than the modern landscape might suggest.
According to the researchers, changes in global temperatures and sea levels may have influenced the distribution and diversity of these animals over millions of years.
Eventually, crocodilians disappeared from the Mediterranean region.
The drying of the Mediterranean around six million years ago is considered an important event in the later history of crocodilians in the region.
Modern technology solved an old fossil mystery
One of the most interesting aspects of the discovery is that the fossil had already been examined by scientists many years ago.
The difference was the technology available to researchers today.
Modern paleontologists can use CT scanning and three-dimensional imaging to study the internal structure of fossils without physically cutting them apart.
Researchers can then compare detailed anatomical measurements with large collections of living and extinct species.
In this case, those methods helped reveal that the Egyptian skull did not belong where scientists had previously placed it.
The finding is a good example of how old fossils can produce new discoveries when researchers revisit them using modern scientific techniques.
What does this tell us about crocodilian evolution?
The discovery could help scientists better understand how gavials and their relatives evolved.
The fossil does not appear to be closely related to some other known gavial-like crocodilians from Africa and the Mediterranean.
Instead, researchers believe Herugavialis represents an early branch of the gavial evolutionary story.
That makes the fossil important not simply because it represents a new name, but because it adds another piece to a complicated evolutionary history.
Fossils such as this can help scientists determine when different groups split from common ancestors and how animals adapted to changing environments.
The surprising connection to the Great Sphinx
The most memorable part of the discovery is undoubtedly its connection with the Great Sphinx.
The fossil crocodilian and the monument are separated by tens of millions of years.
Herugavialis lived roughly 45 million years ago, while the Great Sphinx was created by ancient Egyptians much later.
Yet both are connected through the same rocks.
The limestone containing the fossil formed long before humans existed in the region. Millions of years later, ancient Egyptian builders quarried limestone from the geological deposits around Giza to create monumental structures.
That means the stone associated with one of Egypt's most recognizable monuments also preserves evidence of a completely different chapter in the region's history.
Why the discovery matters
Herugavialis cairensis gives scientists a better understanding of the crocodilians that once inhabited ancient North Africa.
It also highlights how much information can remain hidden inside seemingly ordinary rocks.
The fossil had been known for decades, but modern analysis revealed that it represented something different from what scientists originally believed.
The discovery shows that paleontology is not only about finding new fossils. Sometimes, important discoveries come from looking again at specimens already sitting in museum collections.
For Egypt, the fossil provides another fascinating link between the country's deep geological past and its famous archaeological heritage.
Long before the pyramids, temples and Great Sphinx appeared on the landscape, crocodilian predators were already living in the waters of the region.
And one of those ancient animals has now been given a name of its own: Herugavialis cairensis.
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