Lambeosaurines

Large bony head crests were a dinstinctive feature of these hadrosaurs. Powerful limbs supported a heavy body, and the downward-curving lower jaw had a broad, blunt beak. They lived around the same time as the hadrosaurines, and their remains have been found in North America and Asia.

Hypacrosaurus skull

Hypacrosaurus skull

Hundreds of tightly packed teeth

Hypacrosaurus The head crest of Hypacrosaurus was made of bones that grew up from the nose. Hadrosaurs probably used their hollow crests to amplify the sound of their calls, although the crests may also have improved their sense of smell.

Wide I "duckbill" snout

Hundreds of tightly packed teeth

Wide I "duckbill" snout

Hypacrosaurus The head crest of Hypacrosaurus was made of bones that grew up from the nose. Hadrosaurs probably used their hollow crests to amplify the sound of their calls, although the crests may also have improved their sense of smell.

Air in crest was used to make loud noises

Air in crest was used to make loud noises

Metriorhynchus

Parasaurolophus Air traveled through the long crest of Parasaurolophus before entering the lungs. At one time, scientists wrongly thought that Parasaurolophus occasionally sought food underwater, and used its head crest as a snorkel.

Bony crest

Bony crest

Different crest sizes Lambeosaurines of the same species could have different-sized crests. Crest size is thought to be linked to age and sex. These two skulls belong to Lambeosaurus. The large skull belonged to an adult, while the skull with a tiny crest probably belonged to a juvenile.

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