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World's heaviest animal may be ancient whale found in the Peruvian desert, scientists say

Fossils of a massive ancient whale, known as Perucetus colossus, has been excavated in the Ica Province, southern Peru, allowing scientists to determine its length and weight.

The heaviest animal to have ever lived may have been an ancient colossal whale that was recently discovered in Peru, scientists said.

Scientists have been digging up massive fossils of the new species — named Perucetus colossus, or "the colossal whale from Peru" — in the Ica desert, a region in Peru that was once underwater over the past decade. The discovery was unveiled in a Nature journal published on Wednesday, Aug. 2.

According to the journal, titled "A heavyweight early whale pushes the boundaries of vertebrate morphology," researchers calculated the ancient giant weighed somewhere between 94 and 375 tons (85 and 340 metric tons). Its body stretched to around 66 feet (20 meters) long.

The Perucetus colossus was "possibly the heaviest animal ever," said study author Eli Amson, a paleontologist at the State Museum of Natural History in Stuttgart, Germany, but "it was most likely not the longest animal ever."

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If confirmed, the Peruvian whale would take the top spot from the blue whale, the largest of which weighs within that range at around 200 tons (180 metric tons). The blue whale can also be longer, with some growing to more than 100 feet (30 meters) in length.

"It’s just exciting to see such a giant animal that’s so different from anything we know," said Hans Thewissen, a paleontologist at Northeast Ohio Medical University who did not contribute to the research.

Mario Urbina from the University of San Marcos’ Natural History Museum in Lima first discovered the bones more than a decade ago and an international team has spent years digging them out from the side of a steep, rocky slope — known for its rich marine fossils — in the Peruvian desert.

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So far, paleontologists have found 13 vertebrae from the whale’s backbone, four ribs and a hip bone. Each vertebra weighs over 220 pounds and its ribs measure nearly 5 feet long.

The excavated fossils are 39 million years old and "are unlike anything I’ve ever seen," said study author Alberto Collareta, a paleontologist at Italy's University of Pisa.

Researchers have used 3D scanners to study the surface of the bones and drilled into them to peek inside.

They have also used the partial skeleton to estimate the whale's size and weight.

The new Peruvian whale likely weighs more because its bones are denser and heavier than a blue whale’s, Amson explained.

The density of the bones suggests the whale may have spent its time in shallow, coastal waters, the authors said as other coastal dwellers, like manatees, have heavy bones.

This helps them stay close to the seafloor, experts said.

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Amson said without the skull, scientists cannot be sure what the whale was eating to sustain its huge body.

Its diet may have consisted of scavenging food or eating up tons of krill and other tiny sea creatures in the water.

Thewissen noted he "wouldn’t be surprised if this thing actually fed in a totally different way that we would never imagine."

The Associated Press contributed to this report.

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