The animal known for its ability to run fast and has a long neck is the giraffe. Giraffes are the tallest land mammals, with necks that can measure up to six feet in length. This unique anatomy allows them to reach high branches of trees for feeding, primarily targeting leaves and fruits that are out of reach for many other herbivores. Their long legs also enable them to run at speeds up to 37 miles per hour for short distances, helping them escape predators in the savannahs. Giraffes are social animals and often found in groups, adding to their charm.