Story about a giraffe

Giraffes are mammals, therefore many of the anatomical structure similar to what mammals have also. As with most mammals, a giraffe has seven neck bones. What if he did not have seven bones in the shoulders and the base of the skull? Neck short people who advocate a very balanced head upright posture and very small businesses. A big giraffe head height should be arrested at any time. At the time he was upright, almost half of the neck muscles which weighs about 225 kilograms (500 pounds) is in tension. The amount of muscle required is directly related to the number of joints that must be supported. Reduce the joint until only two (on the skull and on the shoulder) will reduce the weight with a lot of energy and the need for survival also declined.
If this lack of food makes the neck to change, is not the number of neck bones and joints are also in the process of evolutionary change? Of course, the design problem is the loss of flexibility of the neck, and also improve the ability of cracks in many, if giraffes received a blow to the head or neck.

With her head held high in the air, a big giraffe heart must be filled with the blood pumping enough oxygen to within 3 meters (10 feet) to the brain. This will cause problems (involving the blood pressure is too high) when the giraffe lowers her head as she drank the water, if not for a group of unique arterial wall, valve around and prevent the collection of blood, tissue, small blood vessels (rete mirabile, or 'Awesome Network'), and keep the pressure detection signal sufficient blood flow to the brain in the correct pressure. Including those who think this is just 'adaptation to high gravitational pressure in the cardiovascular system', the giraffe is a unique animal.