T. rex and its close relatives were warm-blooded like modern birds

Birds keep warm with heat generated by some of the hardest-working metabolic processes on the planet, while lizards rely on the sun to keep them warm. Both groups are connected to each other dinosaurand for this reason paleontologists have long wondered if dinosaurs had so-called cold-blooded animals metabolism like their lizard cousins, or warm-blooded metabolites like their bird relatives. Now scientists know the answer: It’s both.

An animal’s metabolism refers to how much energy its body uses to carry out normal functions. A higher metabolism — which requires more energy to maintain — means an animal can be more active, but the animal must be consuming enough food and breathing enough oxygen to keep its metabolic engine running. As an added bonus, a high metabolism generates heat that keeps animals warm, hence the term warm-blooded or endothermic. The opposite metabolic strategy requires less energy and is known as cold-blooded or ectothermic. Cold-blooded animals require less oxygen and food than endothermic creatures, but must regulate their body temperature through behavior. Instead of generating their own heat, they maintain their internal temperature by basking in the sun or hiding in the shade.

https://www.livescience.com/dinosaur-metabolism-warm-cold-blooded T. rex and its close relatives were warm-blooded like modern birds

Russell Falcon

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