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Crocodile Meets Godzilla — A Swimming Dino Bigger Than T. Rex

Workers at the National Geographic Museum in Washington grind the rough edges off a life-size replica of a spinosaurus skeleton. (National Geographic)

There once was a place on Earth so overrun with giant, meat-eating predators that even a Tyrannosaurus rex would have been nervous. One predator there was even bigger than T. rex, and scientists now say it's apparently the only aquatic dinosaur ever found.

The swimming monster is called Spinosaurus aegyptiacus. It was 50 feet long — longer than a school bus, and 9 feet longer than the biggest T. rex.

A replica of its skeleton is being assembled in a cavernous room at the National Geographic Society in Washington D.C. As workmen worked to finish erecting the exhibit, I walked around the beast with paleontologist Nizar Ibrahim from the University of Chicago. He collected the bones and, along with Chicago paleontologist Paul Sereno, determined that it was indeed a swimmer.

Ibrahim describes the place in North Africa where this spinosaurus lived 97 million years ago as a "river of giants."

"Big predatory dinosaurs, giant fish, crocodile-like predators. In fact, the place was really pretty predator-heavy, so I call it the most dangerous place in the history of our planet," Sereno says.

It just goes to show ... that evolution is pretty tricky, and does all sorts of weird and wonderful things. And that's what makes the living world — and even the dead parts of the living world — so amazing.
Thomas Holtz, paleontologist, University of Maryland

It was swampy, with many rivers. Now it's a desert, where Ibrahim looks for dinosaur bones. But he didn't find spinosaurus's bones, exactly. They found him.

But first, more about the dinosaur: It takes up most of the room. Its jaw is long, with interlocking front teeth like a crocodile's — good for catching fish, very big fish. Then there are the pits in the bones of its jaw. "These openings house pressure receptors to detect movement of prey underwater," says Ibrahim.

Spinosaurus's nostrils are back near its eyes — better for breathing while half-submerged. It has a long, serpentine neck. Its long front legs are tipped with footlong claws. "Probably used to tear apart prey into bite-size chunks," Ibrahim says gleefully. Along its back, the dinosaur has 7-foot-tall bony spines that stick up like a picket fence. In life, they supported an enormous sail-like crest.

The hips and back legs are narrow and small, considering all the weight they carried. On land, spinosaurus probably shuffled on all fours — a lousy walker, but a great swimmer. Plus its bones are solid, not hollow like most dinosaurs'. That suggests that, as in whales and penguins, the bones of spinosaurus acted as ballast. And its feet are wide, like a wading bird's.

Ibrahim's voice in describing this creature has a new-father's pride. Actually, not so new — as he writes in this week's issue of the journal Science, he and his team spent years examining each of the skeletal characteristics that led them to conclude that this dinosaur was made for swimming.

Now, it was well-known that big swimming reptiles existed in prehistoric times. But dinosaurs are a very different order of animal than reptiles, and nobody had an inkling that dinosaurs could swim until this one turned up.

In fact, spinosaurus bones were first discovered 100 years ago, by a German scientist in Egypt. The find puzzled researchers. "A lot of the skeleton was missing," explains Thomas Holtz, a paleontologist at the University of Maryland. "It was sort of a mystery dinosaur, and the mystery was furthered when all the specimens were destroyed during World War II."

They had been in a museum in Munich that was bombed by Allied planes. Scientists were left with just drawings and, over time, a few more bones that surfaced in Africa. Until recently, paleontologists figured the creature must have lived on land and snagged fish out of rivers — like a giant heron with teeth.

"But we were wrong," Holtz says. "It just goes to show, you know, that evolution is pretty tricky and it does all sorts of weird and wonderful things. And that's what makes the living world — and even the dead parts of the living world — so amazing."

But no more amazing than the way Ibrahim found this new specimen. It started in 2008 in Morocco. A local fossil hunter showed him an odd chunk of bone, a dinosaur bone, but one that puzzled him. Ibrahim didn't make much of it at the time. Then, several years later, he was visiting colleagues at a museum in Italy.

"My Italian colleagues said, 'We have something you have to see. It just arrived here. It's a partial skeleton; it was spirited out of North Africa. We don't really know where it came from.' "

Ibrahim looked at the bones. "And my jaw just dropped," he remembers. "There were just long spines, skull bones, leg bones, and I thought, 'This is amazing.' "

He saw something familiar in the bones. "It looked exactly like that chunk of bone I had seen in Morocco several years earlier," he says. "And I thought, 'You know what? This could actually be the same skeleton.' And so I thought, 'All I need to do now is travel back to Morocco and find this one man in the middle of the Sahara.' "

Ibrahim laughs when he remembers this; his Italian colleagues thought he was crazy.

But if he could find that fossil hunter, maybe he could find the rest of the bones. So, during several trips to Morocco, Ibrahim searched for the guy with the fossils. No luck. He didn't know the man's name, only that he had a mustache. Then last year, Ibrahim was drinking a cup of mint tea in a Moroccan cafe. He says he was ready to quit searching. He looked up and there was a man dressed in white walking by — with the mustache. It was the fossil hunter.

Ibrahim stopped him, and begged the man to show him where that first chunk of bone had come from. He said the Italians wanted to repatriate the bones in their possession to the right place — he had to be sure this was, indeed, the source of those bones.

The man agreed to drive Ibrahim into the desert. They stopped and climbed partway up a mountain, to a hole that had been dug in the rock. And there was the rest of the dinosaur's skeleton.

Scientists now know what the real Spinosaurus aegyptiacus looked like — and that it swam. The Moroccan and Italian bones have been reunited, and will go back to Morocco. And now we know that Earth, apparently, once was home to a 50-foot, swimming, carnivorous dinosaur.

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AUDIE CORNISH, HOST:

And now an introduction to Spinosaurus. There was once a place on earth so overrun with giant meat-eating predators that even Tyrannosaurus Rex would've been nervous. Predators that were even bigger than T-Rex. And scientists say it's apparently the only aquatic dinosaur ever found. NPR's Christopher Joyce reports on the unveiling of this swimming monster.

CHRISTOPHER JOYCE, BYLINE: Spinosaurus was 50 feet long, longer than a school bus. Nine feet longer than the biggest T-Rex. A replica of its skeleton is being assembled in a cavernous room at the National Geographic Society in Washington, D.C. As workmen finish erecting the exhibit, paleontologist Nizar Ibrahim, from the University of Chicago, describes the place in North Africa where Spinosaurus lived 97 million years ago.

NIZAR IBRAHIM: I call it the river of giants with big predatory dinosaurs, giant fish, crocodile-like predators. In fact, the place is really pretty predator heavy, so I call it the most dangerous place in the history of our planet.

JOYCE: It was swampy, with many rivers. Now it's a desert, where Ibrahim looks for dinosaur bones. But he didn't find Spinosaurus's bones exactly, they found him. We'll get to that story in a minute. But first, you've got to see this immense skeleton. It takes up most of the room. Its jaw is long with interlocking front teeth like a crocodiles. Good for catching fish - very big fish. Then there are the pits in its jawbones.

IBRAHIM: These openings house pressure receptors to detect movement of prey underwater.

JOYCE: Its nostrils are back near its eyes, better for breathing while half-submerged. It has a long serpentine neck, its front legs tipped with foot-long claws.

IBRAHIM: Probably used to tear apart prey into bite-size chunks.

JOYCE: Along its back, seven-foot tall bony spines stick up like a picket fence. In life, they supported an enormous, sail-like crest. And the hips and back legs - they're narrow and small for all that weight. On land, Spinosaurus probably shuffled on all fours. This was a creature made for swimming. Ibrahim describes all this in The Journal of Science. Now, there were big swimming reptiles in prehistoric times, but no swimming dinosaurs until this one turned up. In fact, Spinosaurus bones were first discovered 100 years ago by a German paleontologist in Egypt. Scientists were puzzled by them. Thomas Holtz, a paleontologist at the University of Maryland, explains why.

THOMAS HOLTZ: A lot of the skeleton was missing. And it was sort of a mystery dinosaur. And the mystery was furthered when all the specimens were destroyed during World War II.

JOYCE: They'd been in a museum in Munich that was bombed by Allied planes. Scientists were left with drawings and over time, a few more bones from Africa. Until now, they'd speculated that this creature lived on land and snagged fish out of rivers like a giant heron with teeth.

HOLTZ: But we were wrong. And it just goes to show that, you know, evolution's pretty tricky. And it does all sorts of weird and wonderful things.

JOYCE: But no more weird and wonderful than the way Ibrahim found this specimen. It started in 2008 in Morocco. A local fossil hunter showed him an odd chunk of bone - a dinosaur bone, but one that puzzled him. He didn't make much of it. Then several years later, he was visiting colleagues at a museum in Italy.

IBRAHIM: My Italian colleagues said we have something that you have to see. It just arrived here, it's a partial skeleton and it was spirited out of North Africa. We don't know really know where it came from.

JOYCE: He looked at the bones.

IBRAHIM: My jaw just dropped. They were just long spines, skull bones, leg bones. And I thought this is amazing. And I saw something very familiar. It looked exactly like that chunk of bone I had seen in Morocco several years earlier. And I thought, you know what? This could actually be the same skeleton. And so I thought, you know, all you need to do now is travel back to Morocco and find this one man in the middle of the Sahara desert.

JOYCE: If he could find that fossil hunter, maybe he could find the rest of the bones. Ibrahim searched for him - no luck. He didn't even know his name, only that he had a mustache. Then, last year, he was drinking a cup of mint tea in a Moroccan cafe. He was ready to quit. He looked up and there was a man dressed in white, walking by with a mustache - the fossil hunter. The man agreed to drive Ibrahim into the desert to a hole dug in a mountainside. And there was the rest of the dinosaur skeleton. Scientists now know what the real Spinosaurus looked like and that it swam. The Moroccan and Italian bones have been reunited and will go back to Morocco. Christopher Joyce, NPR News. Transcript provided by NPR, Copyright NPR.

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