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Some scientists believe that being tall helps giraffes feed on leaves which are present at greater heights. As shorter herbivores are not able to reach those heights, it decreases the competition for food.

Another study suggests that a giraffe's long neck is evolved to compete or fight for females. Male giraffes whip their neck and swing their heads violently into each other's ribs and neck. This is called necking. The giraffe having longer neck tends to win and hence, is preferred by the female giraffe.

A study also suggests that as the legs of giraffes got longer, their necks also gradually got longer, so that they could easily drink water by bending their necks. Some people also think that being tall helps giraffes spot approaching predators, while some others believe that being tall gave them a larger surface area, thus helping them regulate their body temperature.

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