Dinosaurs often are depicted with very long necks. Nowadays we have the giraffe with a long neck who seem to have evolved this feature due to the need to eat leaves higher up. So why and how the dinosaur with its long neck? Researchers say the how is helped by hollow neck bones. The largest creatures to ever walk the Earth were the long-necked, long-tailed dinosaurs known as the sauropods. These vegetarians had by far the longest necks of any known animal. The dinosaurs’ necks reached up to 50 feet in length, six times longer than that of the current world-record holder, the giraffe, and at least five times longer than those of any other animal that has lived on land.