4.2" Hypacrosaurus Dinosaur Fossil Rib Bone Two Medicine FM Montana COA

Location: Two Medicine Formation, Montana (Private Land Origin)

Weight: 4.9 Ounces

Fossil Dimensions: 4.2 Inches Long, 1.5 Inches Wide, 0.8 Inches Thick

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Hypacrosaurus Dinosaur

Hypacrosaurus was a large lambeosaurine hadrosaurid from late Cretaceous North America, growing up to nine meters long. Its name, meaning “near the highest lizard,” references its size relative to giant predators like Tyrannosaurus, which could reach twelve meters. Fossil evidence suggests Hypacrosaurus and similar hadrosaurs were prey for tyrannosaurs and smaller predators such as Troodon. Bite marks on Edmontosaurus fossils that show signs of healing indicate active predation rather than scavenging, highlighting the dangers these herbivores faced in their ecosystems.

Reproduction was prolific, with nests containing roughly twenty eggs, likely a strategy to offset high juvenile mortality. Smaller predators posed particular threats to hatchlings and younger individuals, ensuring that only a fraction reached adulthood.

Hypacrosaurus is easily recognized by its hollow cranial crest, broader and lower than that of its relative Corythosaurus. Like other lambeosaurines, the crest probably functioned as a visual signal, allowing species recognition among hadrosaurs, similar to how ceratopsian horns and frills differentiated related genera.