The researchers in California told that for the first time they have made a new method to exactly measure the body temperature of dinosaurs by investigating the animal’s teeth.

Chemically examining the fossil teeth from two sauropods of the Jurassic period- dinosaurs with long neck and tails were the largest land animals to move on Earth- demonstrated that they were warm like many modern mammals.

Some analysts forecasted that they were cooler too than most of the animals of lagest size.

The results of the group headed by scientists from California Institute of Technology were printed on Thursday in online edition of Science Journal.

“This is like being able to stick a thermometer in an animal that has been extinct for 150 million years,” said Robert Eagle, an evolutionary biologist and post-doctoral researcher at Caltech who was main writer of the description.

The research supports a rising group of study signifying dinosaurs were more dynamic and full of life than researchers previously thought of.

The question of whether dinosaurs were cold-blooded is still not answered, depending on their atmosphere for heat, or warm-blooded, with own regulated metabolism like modern mammals and their evolutionary offspring, birds.

Eagle told that willpower will come with more research of larger variety of dinosaur species.

The two dinosaurs which were chosen for study-Brachiosauraus brancai and camarasaurus, were closely related to the enormous plant-eating dinosaur called brontosaurus.

The temperature of brachiosaurus was measured at 38.2 degrees Celsius, or 100.8 degrees Fahrenheit. Camarasaurus had a temperature of 35.7 degrees C, or 96.3 degrees F. Examiners say these figures are exact to within 2 degrees Celsius.

Warm Than Crocodiles and Cooler Than Birds

That range is warm than modern and extinct crocodiles and alligators but cool than birds, equal to the temperature of many modern mammals.

Eagle told that due to their large size, Sauropod dinosaurs will probably keep their body heat more efficiently than small warm blooded animals, like humans, even if dinosaurs were cold blooded.

To provide an explanation of this, the examiners told that dinosaurs might be having some psychological or behavioral variation which prevented them from getting hot. One reason could be that they consumed heat by their long necks and tails.

Eagle conveyed that examiners will come to know more things when they use new methods to other species, like meat-eating predators like Tyrannosaurus rex or velociraptors, which were small and fast by their feet.

Earlier the examiners indirectly recorded body temperatures of dinosaurs, dedeucing need of energy and metabolism by the space in fossil footprints which showed how fast they were able to run or the ratio predators to prey in the fossil record.

The direct method of eagle was taken from geological examination by other Caltech scientists, he told. It studies focus of rare carbon and oxygen isotopes in a mineral found in tooth enamel and bone.

Examiners supported their research from an examination of 11 fossil teeth found in Tanzania, Wyoming and Oklahoma and given by museums.

Eagle told that his group started with sauropods as their teeth used for plant eating were large and had more enamel to work upon. Sauropod teeth are also easy to be found in the fossil world, due to the fact that museums and collectors are not willing to give wawy the teeth of dynamic predator species like T. rex.