Why giraffe neck particularly long?

Giraffes are the longest land animals in the world. There had been an exceptionally large giraffe, reaching a height of nearly 6 meters. Giraffe looks strange, elegant body. It is very vigilant and extremely flexible in action. The prominent eyes on the head can simultaneously observe the surroundings. The four long legs support almost a ton of body and run at a speed of 60 kilometers per hour. In Africa's grasslands and forest junctions between the piece of woods, you can see their chewing leaves scene.!
In the early evolutionary era, giraffe's body only deer large, active in Europe, Asia and Africa on the continent. As the earth changes, the giraffe's survival is gradually being concentrated in a few parts of eastern Africa. Biologists studying the evolution of giraffes, giraffes that the ancestors, generations of grass to feed. However, in a drought and other disasters, a large grassland dry, in order to survive, giraffes should always strive to stretch the neck, eat young leaves on the tree, those giraffes with short neck, can not eat the young leaves on the tree, slowly To be eliminated by natural conditions. In this way, after many generations, the neck becomes longer and longer, finally finally forming the present appearance.!
The giraffe's long neck is essential for alerting, understanding the enemy and finding food, and is also an effective cooling tower. Rely on its neck heat, can adapt to the tropical hot plague. As you progress, the long neck of the giraffe can be used to increase motivation. As you walk and run, your head is placed in front of you to push its center of gravity forward
At present, the total number of existing giraffes in the world is about 450,000. Giraffe's unique body and posture, no animal can be compared with it, so by the people's favorite. Zoologists think giraffes are the clever and clever characters of ungulates (Artiodactyla). Nowadays, civilizations have become more and more critical to nature. The giraffes are gentle and gentle, unlike rhinos, which can destroy home-use facilities. Unlike lions, they trample large crops and destroy the woods. They do not bite dead animals like lions and leopards Sheep, harm human beings, giraffes do not go to fight grass with cattle and sheep. If humans no longer foolishly expand their aggressiveness, then giraffes can spend a long time with us humans.