<p>Some 110 million years ago, this armored plant-eater lumbered through what is now western Canada, until a flooded river swept it into open sea. The dinosaur’s undersea burial preserved its armor in exquisite detail.</p>

Some 110 million years ago, this armored plant-eater lumbered through what is now western Canada, until a flooded river swept it into open sea. The dinosaur’s undersea burial preserved its armor in exquisite detail.

Photograph by Robert Clark, National Geographic

It's Official: Stunning Fossil Is a New Dinosaur Species

A new study of the fossil also makes the controversial claim that the armored dinosaur had anti-predator camouflage.

About 110 million years ago in what’s now Alberta, Canada, a dinosaur resembling a 2,800-pound pineapple ended up dead in a river.

Today, that dinosaur is one of the best fossils of its kind ever found—and now, it has a name: Borealopelta markmitchelli, a plant-eating, armored dinosaur called a nodosaur that lived during the Cretaceous period. After death, its carcass ended up back-first on the muddy floor of an ancient seaway, where its front half was preserved in 3-D with extraordinary detail.

Unearthed by accident in 2011 and unveiled at Alberta’s Royal Tyrrell Museum in May, the fossil immediately offered the world an unprecedented glimpse into the anatomy and life of armored dinosaurs.

“It’s a beautiful specimen,” says Victoria Arbour, a

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