I love the watching how graceful giraffes conduct themselves considering the proportions of their bodies. They are the worlds tallest mammals. Their necks are 6 feet long and weigh about 600 pounds. Their legs can also be 6 feet long (taller than most humans) and they can look into a 2nd story building without any problem. Aside from their physical stature, one of the most interesting facts I learned about giraffes is that you will never hear them make a noise. This is because giraffes communicate using noises that are too low for humans to hear, according to PBS Nature. Considering the height of this animals it only makes sense that they are able to twist and bend their large necks for eating and it appears in this photo- for affection to another giraffe.