Montana's state fossil, the Maiasaura, had this type of mouth, like the platypus
[DOC] [TLE] Free Flashcards about NATURAL HISTORY - StudyStack [PAR] NAMED FOR ITS CATTLE-LIKE HORNS, THIS DINOSAUR WHOSE NAME 
MEANS "BULL LIZARD", HAD THE LARGEST ... MONTANA'S STATE FOSSIL, 
THE MAIASAURA, HAD THIS TYPE OF MOUTH, LIKE THE PLATYPUS, DUCK 
BILL ....