On the boundless African prairie, tall acacia trees stand under the clouds, guarding their homes like watchmen. The giraffe's straight neck shows its status as a giant in the animal kingdom. Every season of animal migration, there will be an endless struggle on the prairie, but this struggle constitutes a wonderful harmony on the prairie.

The low grass on the prairie has long been preempted by wildebeests, zebras, antelopes and other animals with flexible legs and feet. When the giraffe reaches the prairie, only the leftovers are cold. Fortunately, it has the height advantage, so the giraffe locks its gluttonous goal on the tall acacia tree.

Day after day, year after year. In order to deal with the giraffe's predation, and for the continuation of this species, the acacia tree began to protect itself. It secretly hid the needle-like acupuncture among the leaves.

After tasting the power of the acacia tree, the giraffe began to fight back on the spot. Its mouth and stomach are armed with thick leather armor, and its tongue for grabbing leaves is made thin and long, so that it can not only easily bypass the acupuncture of acacia tree, but also cause no harm even if the acupuncture is accidentally eaten in the mouth and stomach.

In the first round of the contest, the giraffe obviously gained the upper hand. However, Albizia Albizia was not discouraged, but developed its own weapons more attentively. Giraffes soon found that Ye Er, the albizzia tree they ate in their stomachs, became difficult to digest, and some giraffes lost their lives because they ate more leaves of albizzia. It turns out that this is the second deadly weapon equipped with acacia tree-tannic acid.

In the second round of the contest, the acacia tree was "poisonous" to success. However, it is obvious that the giraffe will never sit still and wait for death. It soon discovered the short board of chemical weapons of acacia tree. It takes 10 minutes for the albizzia tree to release tannins, so giraffes keep an eye on the time when they eat again. Once the leaves start to taste bad for about ten minutes, they stop eating on this tree and look for the next albizzia tree without poison.

In this way, the battle of wits between the acacia tree and the giraffe never stopped. Up to now, Albizia Albizia has played the poison gas bomb to the extreme. The poison gas released can not only stop giraffes from eating, but also remind other partners within 50 meters to strengthen their vigilance. Giraffes are not afraid of weakness, and they can always find the right acacia tree to eat in the poisonous gas bombs surrounded by acacia trees.

In the struggle between acacia tree and giraffe, each kept the relative number of its own species, which is the most wonderful harmony in nature.