Hadrosaurinae

Hadrosaurinae is a subfamily of hadrosaurid dinosaurs, commonly known as duck-billed dinosaurs. These herbivorous ornithischian dinosaurs lived during the Late Cretaceous period. Hadrosaurines are characterized by their distinctive dental batteries, which were rows of tightly packed teeth that formed a powerful grinding surface for processing tough plant material. They also possessed hollow crests on their skulls, though these were generally less elaborate than those found in the related subfamily Lambeosaurinae. The function of these crests is still debated, with theories ranging from display and species recognition to vocalization.

Fossil evidence indicates that hadrosaurines were widespread, with remains found in North America, Asia, and potentially South America. They were bipedal or facultatively quadrupedal, capable of moving on two legs but also using their forelimbs for support. Their diet consisted primarily of vegetation, including leaves, twigs, and pine needles. Hadrosaurines are known from a variety of genera, such as Edmontosaurus, Maiasaura, and Shantungosaurus. The discovery of nesting sites and fossilized young has provided insights into their reproductive strategies and social behavior, suggesting that some hadrosaurines may have exhibited parental care. The study of hadrosaurines continues to contribute significantly to our understanding of dinosaur evolution and paleobiology.