Lizard 's size confirms elevated global temperature during the Cretaceous period . The cold - blooded animals relied on heat from their surroundings to cool their bodies . For Head , the name fit . Man - made global warming in the 21st century pushing temperatures back up in that direction .
Lizard 's size confirms elevated global temperature during the Cretaceous period . The cold - blooded animals relied on heat from their surroundings to cool their bodies . Man - made global warming in the 21st century pushing temperatures back up in that direction .