Millions of years ago T-Rex or Tyrannosaurus Rex was the most fearsome predator to ever walk on the Earth. But after an asteroid collision they all went extinct. Their fossils are currently found in variety of rock formation in different places on Earth.

In their skulls, there are two holes on the top of their head. Scientists believed that those holes were filled with muscles and helped in jaw movements. Which supported T-Rex in having a bite force of about 8000 pounds.

But researchers from the University of Missouri and University of Florida found something different. They have good reasons to believe that those holes regulated the heat and helped T-Rex stay cool.

The modern day alligators have a little similar structure. So they took them for experiment. After analyzing the thermal imaging in the cool and warm conditions they found that, when it was cooler, alligators were trying to warm up. The thermal imaging showed big hot spots in those holes on the roof of their skull and when the environment was warmer, they were trying to do the opposite. So in thermal imaging, the holes appeared darker.

That’s why scientists believe, just like the modern day alligators, those holes on top of T-Rex was not filled with muscles. It was filled with blood vessels. Which was working as a natural air conditioner to keep the T-Rex always in cool mood.

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