Sixty-seven million years ago, in what is now Patagonia, a large predator died mid-meal — its jaws still locked around the leg of a crocodile relative — and in doing so, left behind one of paleontology's most vivid portraits of ancient life. Scientists have now named this creature Joaquinraptor casali, a newly identified megaraptoran dinosaur whose remarkably preserved remains illuminate a group of hunters that science has long struggled to understand. The discovery, published in Nature Communications, not only captures a singular moment of predation frozen in stone, but extends the known stor
Newly discovered dinosaur found clutching crocodile in its jaws
A dinosaur died with its last meal still locked between its jaws
Mark
So we have a dinosaur with a crocodile leg in its mouth. That's the headline. But what does it actually tell us about how these animals lived?
Mimi
It's a window into predator-prey dynamics in the Cretaceous. We don't often get to see what a dinosaur was eating at the moment it died. This one was hunting something large — a crocodile relative — and something went wrong.
Luke
Do we know for certain it choked? Or is that speculation based on the positioning?
Mimi
The researchers suggest choking as a possibility, but the fossil itself doesn't prove cause of death. What we know for sure is the crocodile leg was in the jaws when the animal was buried and fossilized.
Mark
And this Joaquinraptor — it's a new species entirely?
Mimi
Yes, newly identified. But it belongs to a larger group called megaraptorans that we've known about for a while, just not well. This specimen is significant because the skull is so complete.
Luke
How complete are we talking? Is this a full skeleton or just the head and the jaws?
Mimi
The source emphasizes the extensive skull remains. It doesn't specify whether there's a full skeleton, so I'd say the skull is the prize here.
Mark
And these megaraptorans — they were around for a long time?
Mimi
Over 60 million years. From about 130 million years ago until the asteroid hit 66 million years ago. Joaquinraptor lived right at the end of that run.
Luke
So this discovery extends the known range of the group. But does it change what we think megaraptorans were doing, or just confirm they were still around?
Mimi
It confirms they were still hunting, still active, still successful as predators right up to the extinction. That's not nothing. And the prey choice — a large crocodile — tells us they were taking on substantial animals.
Mark
What made megaraptorans different from other big meat-eating dinosaurs?
Mimi
The architecture. Long arms with big claws, lighter skulls, smaller teeth. They weren't built like a T. rex. They were built for a different kind of hunting, though we're still figuring out exactly what that looked like.
El Pulso
- A 23-foot predator died with a crocodile leg still wedged in its jaws, suggesting it may have choked to death on prey too large to swallow — a fatal moment preserved across 67 million years.
- Megaraptorans have long been among paleontology's most poorly understood predators, their fossil record too fragmentary to reveal how they hunted, what they ate, or how widely they thrived.
- The skull of Joaquinraptor casali is among the most complete megaraptoran remains ever found, giving researchers an unprecedented look at the anatomy of these lightly built, long-armed hunters.
- The discovery pushes the confirmed timeline of megaraptorans from 130 million years ago through to the asteroid impact at 66 million years ago, proving they were still actively hunting when extinction arrived.
- Rather than fading gradually from the fossil record, megaraptorans appear to have been vigorous, successful predators right up until the moment their world ended.
Sixty-seven million years ago, in what is now Patagonia, a large predator died mid-meal — its jaws still locked around the leg of a crocodile relative — and in doing so, left behind one of paleontology's most vivid portraits of ancient life. Scientists have now named this creature Joaquinraptor casali, a newly identified megaraptoran dinosaur whose remarkably preserved remains illuminate a group of hunters that science has long struggled to understand. The discovery, published in Nature Communications, not only captures a singular moment of predation frozen in stone, but extends the known story of megaraptorans all the way to the final chapter of the dinosaur age.
Paleontologists working in central Patagonia have uncovered the remains of a dinosaur that died with its last meal still locked in its jaws — the leg of a large crocodile relative. The creature, newly named Joaquinraptor casali, lived roughly 67 million years ago near the close of the dinosaur age. Measuring about 23 feet long and weighing around a ton, it belongs to a group of predators called megaraptorans, and its discovery, published in Nature Communications, offers rare clarity into one of paleontology's least understood lineages.
What makes the fossil extraordinary is not only the extent of the skull remains, but the circumstances of preservation. The crocodile leg still rests between the dinosaur's jaws, raising the possibility that Joaquinraptor choked while attempting to consume prey too large to manage — dying mid-meal, its kill still in its mouth. The fossil captures a single violent moment suspended across deep time.
Megaraptorans were built differently from other large predators of the Cretaceous. Their skulls were elongated and lightly constructed, their teeth relatively small. What set them apart were their long, powerful arms ending in three fingers bearing large, sharp claws — anatomy suited to grappling and tearing. They ranged across South America, Asia, and Australia, yet how they hunted has remained largely mysterious.
Lucio Ibiricu of the Instituto Patagónico de Geología y Paleontología in Chubut, Argentina, led the research team and noted that megaraptorans rank among the least understood of all dinosaurs, their fragmentary fossil record making it difficult to reconstruct their lives. Joaquinraptor changes that picture. With the earliest known megaraptoran dating to roughly 130 million years ago, this new species confirms the group thrived for tens of millions of years — not fading away, but still actively hunting when the asteroid struck 66 million years ago and ended their world entirely.
Paleontologists working in central Patagonia have unearthed the remains of a dinosaur that died with its last meal still locked between its jaws — the leg of a large crocodile relative. The creature, a newly identified species named Joaquinraptor casali, lived roughly 67 million years ago, near the end of the age of dinosaurs. It measured about 23 feet long and weighed around one ton. The discovery, published this week in Nature Communications, offers rare clarity into a group of predators that has long remained poorly understood by science.
What makes this fossil extraordinary is not merely its completeness — the skull remains are extensive — but the circumstance of its preservation. The crocodile leg still rests in the dinosaur's jaws, suggesting a violent and possibly fatal encounter. One possibility that emerges from the evidence is that Joaquinraptor choked while attempting to consume its prey, dying mid-meal with the kill still in its mouth. The fossil thus captures a moment of predation frozen across millions of years.
Joaquinraptor belonged to a group of meat-eating dinosaurs called megaraptorans, creatures that roamed South America, Asia, and Australia during the Cretaceous Period. They were built differently from many of their large predatory cousins. Their skulls were elongated and lightly constructed rather than heavily built. Their teeth were relatively small. But their arms were long and powerful, equipped with three fingers that bore large, sharp claws — weapons suited to grappling and tearing. These were hunters built for a particular kind of predation, though exactly what that predation looked like has remained largely mysterious.
Lucio Ibiricu, a paleontologist at the Instituto Patagnico de Geologa y Paleontologa in Chubut, Argentina, led the research team that analyzed the fossil. In a statement accompanying the study, Ibiricu noted that megaraptorans rank among the least understood dinosaurs of all. The fossil record for this group has been fragmentary, making it difficult to piece together how they lived, what they ate, and how successful they were as a lineage.
The timeline of megaraptorans now extends across a vast span of deep time. The earliest known member of the group lived approximately 130 million years ago. Joaquinraptor, at 67 million years old, demonstrates that megaraptorans not only survived but thrived for tens of millions of years after their earliest ancestors appeared. They persisted right up until the asteroid impact that ended the age of dinosaurs 66 million years ago — meaning Joaquinraptor lived in the final moments of its kind, in the final moments of its entire world. The fossil thus closes a gap in the paleontological record, showing that this enigmatic group of predators did not fade away gradually but were still actively hunting when the extinction event struck.
Citas Notables
Megaraptorans are among the least understood dinosaurs of all— Lucio Ibiricu, lead paleontologist on the study
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