There is at least one example , in the related Corythosaurus , of a slender stapes ( reptilian ear bone ) in place , which combined with a large space for an eardrum implies a sensitive middle ear , and the hadrosaurid lagena is elongate like a crocodilian 's .
There is at least one example , in the related Corythosaurus , of a slender stapes in place , which combined with a large space for an eardrum implies a sensitive middle ear .