Warm-blooded versus cold-blooded
Biochemical processes are heat dependent. The rule of thumb is that they go faster when they are warm and slower when they are cold.
Warm-blooded vertebrate animal with mammary glands, usually viviparous and having hair or fur ...
Warm-blooded for organisms that fall in between both categories.
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Look up Cold-blooded in
Wiktionary, the free dictionary.
Some of this heat is used by warm-blooded animals, mammals and birds, to maintain their internal temperatures.
Adaptation. Living things are suited to their mode of existence.
Birds and mammals are "warm-blooded' or homeothermic, maintaining their body temperature within narrow limits, no matter what the ambient temperature.
2. (Science: zoology) a warm-blooded, feathered vertebrate provided with wings. See aves.
3. Specifically, among sportsmen, a game bird.
Remember, not all animals that fly have feathers, but all almost every endothermic animal (warm-blooded) has a covering of hair or feathers for insulation. The recent (1999) discovery of a "feathered" dinosaur adds credence to this speculation.
Homeostasis can manifest itself at the cellular level through the maintenance of a stable internal acidity (pH); at the organismal level warm-blooded animals maintain a constant internal body temperature; and at the level of the ecosystem, ...
In addition, dinosaurs evolved to be warm-blooded. Warmbloodedness allows an increase in the vigor of movements in erect organisms. Splay stanced organisms would probably not benefit from warm- bloodedness. Birds evolved from sauriscian dinosaurs.
 See also: Blood, Animal, Organ, Animals, Species
  
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