Hadrosaurs - More On The Duckbilled Dinosaur

1. Hadrosaurs - More On The Duckbilled Dinosaur Hadrosaurs, the “duckbilled dinosaurs,” were said to be common in the Upper Cretaceous of Europe, Asia, and North America. They were considered members of Ornithopoda and very close relatives and possible descendants of the earlier iguanodontid dinosaurs. Interpretations Early studies of some of the best fossil impressions suggested that hadrosaur feet were webbed. In contrast, recent hypotheses based on the discoveries in recent years reveal a similar story. It indicates that hadrosaurs had pads identical to those seen on camel feet. Researchers and other people worldwide love to have skull bones and Hadrosaur teeth for sale belonging to small hadrosaurs collected from the Prince Creek Formation near the Colville River. Their stiff tails, supported by ossified tendons and sturdy bones, suggest that hadrosaurs spent most of their time on land, though close to several water bodies, feeding on tough terrestrial plants. Some spectacularly preserved hadrosaur nests and young shows that hadrosaurs migrated to nesting grounds to reproduce. Studies suggest that two subfamilies of hadrosaurs, the Lambeosaurinae, which have a crest on the skull, and the Hadrosaurinae, which lacked the crest. The crest on a lambeosaur’s skull contains the nasal

2. passage, which looped through the crest and often formed sizeable chambers before passing into the airway. Several hypotheses have been seriously suggested for the question - “Why The Crest?” * The crest enabled lambeosaurs to breathe fire from their nose. (However, there has been no evidence of the nose being exposed to high temperatures regularly). * The crest was a snorkel so that the lambeosaurs could breathe underwater. * The crest warmed the air that the lambeosaurs were breathing. * The crest was an extra reservoir of air for swimming lambeosaurs. The most widely accepted theory regarding the crest function is that it served as a resonating chamber, allowing lambeosaurs to make a deep, loud sound. Such calls warned of predators, kept the herd together or attracted potential mates, or did all these things. The setting in which the fossils were discovered also indicates the environments in which hadrosaur lived. In general, dinosaurs were land dwellers, which is why their remains are usually found in rocks deposited in rivers and lakes. This wasn’t the case with all species of Hadrosaurs. Francois Therrien, the curator at the Royal Tyrrell Museum, said that: “It was very fortunate that individuals of the same species happened to float out to the sea and sink at the bottom, where they were buried. Their natural preservation in the fine mud significantly contributed to the fossilization of large patches of skin resembling that the flanks of these animals were covered in a mosaic of large and small scales.” Therefore, researchers still study this dinosaur to help determine more relevant information about the species.