Male and female giraffes are alike except that males are larger and more muscular. Male giraffes grow to 17 feet tall and 3000 pounds. Females only reach 14 feet and 2500 pounds Young giraffes are so lovable. Born at a height of 5'6" they are a lot closer to a human's size. An adult giraffe's neck is about six feet long (1.8M) and very muscular. The neck is made up of seven bones just like a human's neck, but the giraffe's neck bones are much larger.