Scientists still haven't settled the hot debate over whether dinosaurs were warm-blooded like birds and mammals or cold blooded like reptiles, fish and amphibians.
And some research suggests that dinos may be somewhere in between.
A new video (above) from the YouTube series SciShow explains that an analysis of dinosaur bones may prove that dinosaurs were mesotherms, not quite hot-blooded and not quite cold-blooded either. The mesothermy theory may help explain how the giant prehistoric creatures could have stayed active in cold weather -- when cold-blooded animals could not have -- and conserve energy when needed.
Are there any mesotherms alive today? The great white shark, tuna, and echidnas are just some of the middle-blooded creatures that are still thriving.
Previously on HuffPost Science: Dinosaurs May Have Been Warm-Blooded, After All
What other debates and common misconceptions are out there when it comes to dinosaurs? Check out the "Talk Nerdy To Me" episode below for five dinosaur myths that you probably thought were true.