Hadrosaurs, the so-called "Duck-billed" dinosaurs have been compared to cows on a regular basis. I think the main idea with this comparison is in the idea that there were likely vast herds of these dinosaurs stretching as far as the eye could see in different regions of the world during the Cretaceous. One of those dinosaurs was Edmontosaurus. Possibly not the most exciting in appearance, we know that Edmontosaurus annectens was a well distributed genus across North America, consists of two recognized species (E. regalis, Type species, Lambe 1917 and E. annectens, Marsh 1892) has a number of synonyms associated with it including Anatotitan, Anatosaurus, and Trachodon. Appearing as a "typical" hadrosaur (probably only outshined by the familiar appearance of Iguanodon in this respect), Edmontosaurus is a large herbivore and some might remark that it is quite unremarkable. The type specimen is estimated to have been between 9 and 12 m (30 and 39 ft) long and may have weighed as much as 4 tons. A handful of both species have even been discovered as fossilized mummies or have been associated with skin impressions and even a rhamphotheca, the keratinous portion of the beak-like end of the mouth and snout.