It is a type of dinosaur that lived in the Jurassic period, belonging to the bird hipped dinosaur order. Its name comes from Greek, meaning "ostrich lizard", mainly because they have long legs and running ability similar to ostriches. Large in size, generally up to 10 meters in length and 3 meters in height. The head is relatively small with a beak shaped mouth, suitable for chewing plants. The tail of the avian dragon is long and strong, which can be used to maintain balance or as a defensive tool. It is a social animal that feeds on plants and mainly lives in forests and swamps. The forelimbs are relatively short, with five fingers, but the thumb is particularly developed, forming a sickle like structure for defense or digging.