Continuity in cold-blooded (variable temperature) Animal view of scholars primarily on the basis that reptiles, like dinosaurs, and now belongs to relatively lower animals, crocodiles, frogs, snakes are typically cold-blooded. The body temperature of these animals as the outside temperature changes in the lift, you can save the consumption of physical strength without the need for a strong heart to maintain blood circulation, the skin does not need to have sweat glands, sweat encountered high temperature is used to maintain a constant temperature of various parts of the body. most of the cold-blooded animals have a dormant feature, to find a suitable temperature of the cave to prevent the body temperature dropped below 0 ℃, otherwise it should be frozen dead. Advocates dinosaurs were cold-blooded to say scholars trouble. Yes ah, Could dinosaurs have to be dormant do? Then a large body hiding shelter where it? During hibernation how to solve security problems? If you do not dormant. The cold winter is cold-blooded tough season, ah, dinosaurs is how to do it through the long winter? In addition, even cold-blooded, body temperature is too high or too low, lack energy, such as crocodiles at about 35 ℃ when the temperature can be so easily. By what means they get the best temperature requirements? Is mainly the sun, to get the energy from sunlight, temperature gradually rose to about 35 ℃. So, what is a huge dinosaur on optimal temperature requirements? If you also rely on the sun, it is difficult to justify, after speculation the heaviest 80-ton dinosaur, so giant, relying on the sun to heat up, have to constantly turn a huge body, finished one side and then sun drying the other side, simply could not imagine! Moreover, in order to survive need to keep eating dinosaur food appetite is very large, the total can not be lazy all day sun ah! Therefore, some scholars have put forth the dinosaurs of warm-blooded animals, the body temperature constant, just like the elephant. According to evolutionary theory, there is a dinosaur was bird ancestor. Want to know dinosaurs are laying eggs, and birds, recent excavations of dinosaur fossils found to have traces of feathers and soft tissue, while the birds are warm-blooded animals, body temperature constant, feathers in order to keep out the cold. This theory seems reasonable. However, warm-blooded animals that encountered a greater trouble, is still a huge dinosaur body caused by problems, is ah, maximum height of 9 meters above the dinosaurs, more than 20 meters in length and weighing up to 80 tons, required a huge heart of how ah! In order to promote such a large amount of blood to maintain blood circulation to meet the needs of all parts of the body ah! Even the most simple dinosaur blood circulatory system, once drawn, flatly rejected by the people immediately, the animal will never be able to have such a powerful heart of its blood supply.