The weather these animals faced over 70 million years ago averaged 42 화씨 (5.6 섭씨 온도), 그는 지적했다, with freezing winters. During those cold months, the dinosaurs were plunged into four months of total darkness, making it even more challenging to survive the harsh climate, Druckenmiller said.
Finding the small bones and teeth were no easy task, 그는 덧붙였다.
When Druckenmiller and his team excavated the site, they kept every grain of sediment to inspect. Each piece larger than half a millimeter was preserved and examined under a microscope.
“Over the last decade we must have inspected hundreds of thousands of little grains of sand to find a full handful of fossils,” Druckenmiller said.
The discoveries of “polar dinosaurs” in high latitudes has been somewhat perplexing, said Anthony Fiorillo, senior fellow at the Institute for the Study of Earth and Man at Southern Methodist University in Dallas, 연구에 참여하지 않은 사람.
Body heat in the cold
Fossils found in the Arctic over the past 20 years have helped researchers better understand how dinosaurs thrived in cold climates, 그는 말했다.
“The value of this study is that it broadens our understanding to now include many kinds of dinosaurs living year-round in the Cretaceous Arctic,” Fiorillo said.
This discovery also alludes to the idea that dinosaurs may have been warm-blooded creatures, Druckenmiller said.
Unlike cold-blooded animals like crocodiles and lizards, who rely on their external environment to regulate their body temperature, warm-blooded creatures can make their own internal heat.
This isn’t the first study to hypothesize this theory, “but it does lend more support to the idea of dinosaurian warm-bloodedness,” Fiorillo said.
Druckenmiller’s team still has much to study, 그는 말했다, including the lifestyle of these dinosaurs. The plant eaters might have survived off low-quality forage to survive the winter, 그는 말했다, while small species may have hibernated.