Montana's state fossil, the Maiasaura, had this type of mouth, like the platypus
..... Fossils of 
Achelousaurus and Einiosaurus have both been found in Montana, from the... [DOC] [TLE] Educator's Guide - Museum of Idaho [PAR] Truth - There are many different types of fossils including dinosaurs, animals with 
.... Turtles, alligators, crocodiles, birds, platypuses, spiny anteaters, and most 
snakes.