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April 1, 2024

WASHINGTON — Picture the fearsome creatures of “Jurassic Park” crossed with the shark from “Jaws.” Then super-size to the biggest predator ever to roam the Earth. Now add a crocodile snout as big as a person and feet like a duck’s.

A full-sized skeletal model of a Spinosaurus, the largest predatory dinosaur ever to roam the Earth, is seen in a new exhibit at the National Geographic Museum in Washington, DC

The result gives you some idea of a bizarre dinosaur that scientists unveiled Thursday.

This patchwork of critters, a 50-foot predator, is the only known dinosaur to live much of its life in the water.

The beast, called Spinosaurus aegyptiacus, was already known to scientists from a long-ago fossil discovery, but most of those bones were destroyed during World War II. Now, 70 years later, a new skeleton found in Morocco reveals that the beast was far more aquatic than originally thought.

University of Chicago paleontologist Paul Sereno looks inside the jaws of a 50-foot life-size model of a Spinosaurus dinosaur at the National Geographic Society exhibit in Washington, DC.AP

Spinosaurus had a long neck, strong clawed forearms, powerful jaws and the dense bones of a penguin. It propelled itself in water with flat feet that were probably webbed, according to a study released Thursday by the journal Science. The beast sported a spiny sail on its back that was 7 feet tall when the beast lived 95 million years ago.

“It’s like working on an extraterrestrial or an alien,” study lead author Nizar Ibrahim of the University of Chicago said, while standing in front of a room-size reconstruction of the skeleton at the National Geographic Society. “It’s so different than anything else around.”

Ibrahim described the creature as “so bizarre, it’s going to force dinosaur experts to rethink many things they thought they knew about dinosaurs.”

Scientists had thought that all dinosaurs stuck to the land, with occasional brief trips into the water. But the new skeleton shows clear evidence of river and lake living: hip bones like a whale’s, dense bones that allowed it to dive for food, and nostrils positioned high on the skull, allowing Spinosaurus to mostly submerge.

Paleontologist Paul Sereno speaks during an interview in front of a 50-foot life-size model of a Spinosaurus dinosaur.APAP

It could walk and would probably nest on land, but on land it moved more awkwardly than on water, said study co-author Paul Sereno of the University of Chicago. It lumbered on its two hind feet because its powerful forelegs with sharp curved claws were designed more for killing than walking, he said.

Sereno called it “an evolutionary experiment going into the water.”

The new find is amazing and convincing, showing how wrong scientists have been about this dinosaur and about how diverse dinosaurs could be, said University of Maryland dinosaur expert Thomas Holtz Jr., who wasn’t part of this study.

It’s also a creature that once was lost to history and war. German paleontologist Ernst Stromer first discovered Spinosaurus bones in Egypt in 1912. The bones went back to Europe, but in 1944, most were destroyed in the bombing of Munich in World War II. Spinosaurus was lost.

But in 2008, Ibrahim was in Morocco on a quest for Spinosaurus. It wasn’t going well. He had heard of a local dealer who might know where some bones were, but couldn’t find him. Ibrahim had given up hope and was contemplating returning home while sitting in a cafe. He looked up and spotted the dealer walking by.

University of Chicago paleontologists Paul Sereno (left) and Nizar Ibrahim in front of a 50-foot life-size model of a Spinosaurus dinosaurAP

They went to a Moroccan dig site and found a mostly complete set of bones.

Spinosaurus, which grew some 9 feet longer than Tyrannosaurus rex, feasted on aquatic creatures the size of cars in an area that “was the most dangerous place in the history of man,” Ibrahim said. Three giant predators nearly the size of a T. rex roamed on land. Even the sky had giant predators. And in the water, 25-foot sharks, giant sawfish and six or seven types of ancient nasty crocodiles lurked.

Sereno noted that a Spinosaurus did fight a T. rex in the movie “Jurassic Park III,” but it was a land battle and based on the old conception of the dinosaur. In reality, the two didn’t live on the same continent or in the same time period.

In the movie, the Spinosaurus won. And Sereno said if the two species had fought in the water, Spinosaurus would have won easily.