Gigantism and acromegaly are two disorders with the same disease mechanism and somewhat similar presentations. Even though they have the same disease mechanism, the two have entirely different outcome simply due to the age of onset. Gigantism is the result if the disease mechanism starts in childhood.
Adult Velociraptors grew up to 6.8 feet (2 meters) long, 1.6 feet (0.5 meter) tall at the hip and weighed up to 33 pounds (15 kilograms).
Of all the dinosaurs in this slideshow, Utahraptor has the greatest potential to supplant Velociraptor in popularity: this early Cretaceous raptor was huge (about 1,500 pounds), fierce enough to take down plus-sized herbivores like Iguanodon, and blessed with a headline-friendly name that makes Saurornitholestes and Unenlagia sound like random jumbles of syllables.