Collector's Addition

Look: Arctic fossil haul reveals dinosaurs lived year-round in cold conditions

Yet more evidence that these prehistoric giants were warm-blooded.

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The idea that dinosaurs were exclusively cold-blooded lizards has lost its footing over the past decade.

Researchers are finding more evidence that some dinos were active in colder regions, indicating they were probably warm-blooded.

Remains have even been found above the Arctic circle.

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Patrick Druckenmiller

And a new study in Biology Letters gives even more weight to the idea that some dinosaurs lived year-round in the Arctic and Antarctic.

The research team spent roughly a decade completing excavations of a massive fossil haul in a North Alaskan region known as Prince Creek Formation.Kevin May

Patrick Druckenmiller/Current Biology

They uncovered a bounty of microfossils — bits of bones and teeth from baby dinosaurs.

James Havens

The researchers estimate that these remains represent at least 7 different species, both small- and large-bodied herbivores and carnivores.

"These represent the northernmost dinosaurs known to have existed"

Dr. Patrick Druckenmiller, study author

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Though the researchers did not uncover any eggs, the presence of baby dinosaur remains shows that the species who found a home there stayed for breeding season, and may have been present year-round.

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Arctic temperatures were warmer during the Cretaceous period, but high latitudes still meant several months of darkness per year and freezing temperatures in the winter.

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Now the researchers are left with lingering questions. Namely: how did the dinosaurs cope with Arctic darkness, food scarcity, and extreme cold?

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Alas, the lives of our favorite prehistoric creatures keep us in hot — or this case, cold — pursuit.

Read more stories about science here.

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