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

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

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

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.

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.

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

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