Are dinosaurs warm-blooded, cold-blooded or thermostatic?

Artwork of a spinosaurus dinosaur

Dinosaurs were once thought to be Mesozoic cold-blooded animals, but recent studies have shown that dinosaurs grow as fast as mammals, suggesting that they may be warm-blooded. These two different views diverge greatly. Some paleontologists speculate that dinosaur cells are between cold-blooded animals and warm-blooded animals, and they may be thermostats.

Are dinosaurs warm-blooded, cold-blooded or thermostatic?

Dinosaurs are considered reptiles, so scientists believe that dinosaurs, like reptiles, should be cold-blooded animals, meaning that they can regulate their body temperature through their environment, and that the slow metabolism of cold-blooded dinosaurs forces them to walk slowly. Some scientists believe that hot-blooded dinosaurs can control their body temperature and have a faster metabolic mechanism.

Researchers have been arguing about the thermoregulation mechanism of dinosaurs for decades, but the latest controversy began in a 2014 article in the Journal Science, which reported that dinosaurs were probably thermostats. In fact, previous studies of dinosaur energy change rate, energy consumption and dental analysis concluded that dinosaurs were warm-blooded animals. The answer to this question can not be solved by a scientific report alone, but by studying and analyzing the complete process of how dinosaurs lived and died.

To solve this mystery, researchers studied dinosaur skeleton fossils, which have growth rings that, like tree rings, are thought to indicate how fast the animal grows. Researchers compared the growth rate of dinosaurs with other extinct and existing animals and found that the growth rate of dinosaurs was just between cold-blooded and warm-blooded animals.

When using different techniques to analyze data, Michael D’Emic, author of the study and lecturer of Anatomical Science at Stony Brook University School of Medicine, was surprised to find that dinosaurs were not between warm-blooded and cold-blooded animals. Their metabolism and growth rates were similar to those of mammals. The final conclusion was that dinosaurs were born. The growth rate is very close to that of warm-blooded mammals. The latest study was published in the May 29 issue of the Journal Science.