what kind of dinosaur is ducky

Ducky from The Land Before Time is a Saurolophus, a member of the hadrosaurid family of "duck-bill" dinosaurs. This identification is supported by characteristics such as her distinct head crest that juts out and backward, matching fossil records of Saurolophus. While there has been some debate among fans and critics about her exact species, with suggestions including Parasaurolophus and Edmontosaurus, the most widely accepted classification for Ducky is Saurolophus based on her design and features shown in the series.