There are three kinds of giraffes. The ones shown here are Masai Giraffes. The two other kinds of giraffes are called Reticulated and Rothschild's. They have different patterns and live in different areas of Africa. The average male giraffe reaches about seventeen feet in height, females are smaller. Both sexes have horns which are projections of bone covered by skin and hair. Even though giraffe necks are so long they only have seven vertebrae, the same number as humans. Giraffes use their long necks to graze on acacia tree leaves. They feed in the early morning and late afternoon. Other times they are at rest, either standing or lying down.