There are lot many articles on the said phenomenon and one by physician Dr. Howard Glicksman which is titled as ‘Understanding temperature: Cold blooded vs. warm blooded animals’ [1] is a treat to read wherein he describes what it means to be cold and warm blooded and what might be required for one to develop into the other. Dr Glicksman explains that being warm blooded has its own advantages like ability to support highly complex energy dependent organs like brain and maintaining a core temperature that is often far higher than its environment. Furthermore to maintain core temperature warm blooded ones uses more of the energy obtained from food as heat and this means requirement of much more food (often five to ten times higher) for survival. Also as per article conventional scientific wisdom says that warm blooded animals evolved from cold blooded ones. Little else is said about what viable transitions in this evolutionary conversion could have taken place and to convert a cold blooded animal into a warm blooded animal is like converting a model t-ford into Lexus etc.

Warm and Cold-Bloodedness in a Newer Perspective

In a comparison of a single mammalian (_R. norvegicus) and reptilian species (A_^ vitticeps) of the same body weight and "preferred" body temperature,the metabolic capacity for energy production was assessed in liver, heart, brain, kidney, lung and skeletal muscle tissues by two methods: measurement of mitochondrial enzyme activity (cytochrome oxidase) and measurement of mitochondrial volume and membrane surface area densities. Both methods showed the mammal to possess an average 2-3 fold greater metabolic capacity per gram of tissue. When the larger relative tissue sizes of the mammal wereincluded into the comparison the differences were increased to approximately 5 fold. When the mitochondrial enzyme activities of the six mammalian and reptilian tissues were expressed per gram of tissue protein the differences were reduced. This was because all the reptilian tissues measured had significantly less protein per gram of tissue than the mammalian tissues. Isolated mitochondria from the same six tissues showed the mammalian mitochondria in general to have more protein and less lipid than the reptilian mitochondria and similar oxygen consumptions (measured using cytochrome oxidase) per mg of protein for liver, brain and kidney mitochondria. Isolated mammalian lung, heart and skeletal muscle mitochondria however, consumed twice the amount of oxygen consumed by the same reptilian mitochondria per gram of mitochondrial protein. To assess the use of energy by the same mammalian and reptilian species the "in vitro" oxygen consumption of liver, kidney and brain

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Studies in the evolution of endothermy: mammals from reptiles

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Studies in the evolution of endothermy: mammals from reptiles