by Laura Geggel, Staff Writer | September 22, 2015 03:10pm ET
Deep in the dark, snowy wilds of Alaska, a herd of young duck-billed dinosaurs rambled across the frozen Earth. But something cut their lives short, and they remained there, crushed, until scientists discovered their remains, 69 million years later.
Exactly how the 30-foot-long (9.1 meters) herbivores managed to survive the cold is unclear. But the finding — almost 10,000 bones of mostly juvenile individuals — has set a new record: No other dinosaur fossils have been found this far north, the researchers said.
"The finding of dinosaurs this far north challenges everything we thought about a dinosaur's physiology," lead researcher Greg Erickson, a professor of paleobiology at Florida State University, said in a statement. "It creates this natural question: How did they survive up here?"
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