Giraffes are the tallest land animals. A giraffe could look into a second-story window without even having to stand on its tiptoes. A giraffe's 6-foot neck weighs about 600 lbs. The legs of a giraffe are also six feet long. The back legs look shorter than the front legs, but they are about the same length. A giraffe's heart weighs about 25 lbs, and its lungs can hold 12 gallons of air. Giraffes have a small hump on their back and a spotted pattern similar to that of a leopard—which is why people once called the giraffe a camel-leopard. That's where the giraffe's species name, Camelopardalis, comes from! Many people think that giraffes have no voice, but they do make a variety of sounds, including moos, roars, snorts, hisses, and grunts.