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).
An ostrich would look like an undernourished dwarf beside a huge beaked feathered dinosaur recently discovered in China's Gobi Desert. The ostrich-like dino weighed as much as a rhino (around 1.5 tons) and was over 16 ft (5 m) tall, being the biggest feathered animal ever and the largest toothless dinosaur known so far. Gigantoraptor erlianensis lived 70 million years ago, to the end of the dinosaur era, when it reached an evolutionary peak.