Hadrosaurines

This group of hadrosaurs had little or no head crest, although some had a bump above the nose which they used for making Hadrosaur family noises. Some hadrosaurines had bills

Maiasaura bred in huge that curled upward, forming a spoon rabmes, usmg the same shape. They lived in North America, nestings^ e^ year. The ^ and Asia during the late name Maiasaura means good ^^^ r^ ■

mother lizard"; Maiasaura cared Cretace°Us period.

for their young until they could fend for themselves.

Large eyes

Noise pouch

Edmontosaurus had skin flaps over its nasal cavities. They normally lay flat but could inflate, allowing Edmontosaurus to make bellowing sounds

Wrinkled, deflated pouch

Wrinkled, deflated pouch

Pouch inflated when noise was made

Juvenile maiasaura A juvenile Maiasaura differed in many ways from an adult Maiasaura. The most noticeable difference was the juvenile's head, which was much shorter.

Young Maiasaura were in constant danger from predators such as the tyrannosaurids.

Young Maiasaura were in constant danger from predators such as the tyrannosaurids.

Edmontosaurus Maiasaura

Edmontosaurus may have made noises to warn others of danger, attract a mate, or threaten a rival.

Pouch inflated when noise was made

Edmontosaurus may have made noises to warn others of danger, attract a mate, or threaten a rival.

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