3.9" Hypacrosaurus Dinosaur Fossil Coracoid Bone Two Medicine FM Cretaceous MT COA
Location: Two Medicine Formation, Montana (Private Land Origin)
Weight: 7.7 Ounces
Dimensions: 3.9 Inches Long, 2.5 Inches Wide, 1.6 Inches Thick
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Hypacrosaurus Dinosaur
The name Hypacrosaurus translates to "near the highest lizard," referencing its close comparison to Tyrannosaurus, one of the most formidable dinosaurs of late Cretaceous North America. While Tyrannosaurus reached lengths of up to twelve meters, the largest Hypacrosaurus measured approximately nine meters. Evidence suggests that Hypacrosaurus and similar species were preyed upon by Tyrannosaurus and related genera such as Albertosaurus, as demonstrated by a significant healed bite wound on an Edmontosaurus matching Tyrannosaurus dental patterns. The presence of around twenty eggs per Hypacrosaurus nest indicates a high reproductive rate, likely an evolutionary response to significant predation pressure. In addition to tyrannosaurs, smaller predators like Troodon posed threats to juvenile Hypacrosaurus, limiting their survival to adulthood.
The crest of Hypacrosaurus is similar to that of its relative Corythosaurus, though wider and not as high. This crest was also hollow, which confirms its establishment as a lambeosaurine hadrosaurid (the group typified by Lambeosaurus). Several theories have been made about the function of lambeosaurine head crests, though the one with the most support concerns visual display so that different species of hadrosaur can tell each other apart, probably in a similar fashion to how the differences in the forms of horns and neck frills allow different genera of ceratopsian dinosaurs to be identified.
