It is impressive to watch this reticulated giraffe’s huge strides as it walks at the Honolulu Zoo. A male’s height to the top of his ossicones or head bumps can reach 19 feet. His neck can measure eight feet. They weigh between 2,400 to 4,200 pounds and eat about 75 pounds of leaves a day. Surprisingly, the world’s tallest mammal only drinks water every other day.