Hadrosaurs o dinosaurios de pico de pato de la familia hadrosauridae eran dinosaurios herbívoros del período cretácico superior.

Hadrosaurs or duck-billed dinosaurs of the family Hadrosauridae were herbivorous dinosaurs of the Upper Cretaceous Period. Colour printed illustration by Heinrich Harder from "Tiere der Urwelt" Animals of the Prehistoric World, 1916, Hamburg. Heinrich Harder (1858-1935) was a German landscape artist and book illustrator. From a series of prehistoric creature cards published by the Reichardt Cocoa company. Natural historian Wilhelm Bolsche wrote the descriptive text.