 Comparisons between the scleral rings of Corythosaurus and modern birds and reptiles suggest that it may have been cathemeral , active throughout the day at short intervals . The sense of hearing in hadrosaurids , specifically such as Lophorhothon , also seems to have been greatly developed because of an elongated lagena . The presence of a thin stapes ( an ear bone that is rod @-@ like in reptiles ) , combined with a large eardrum implies the existence of a sensitive middle ear . It is possible that hadrosaurid ears are sensitive enough to detect as much sound as a modern crocodilian . 
 Comparisons between the scleral rings of Corythosaurus and modern birds and reptiles suggest that it may have been cathemeral , active throughout the day at short intervals . The sense of hearing in hadrosaurids , specifically such as Lophorhothon , also <a href='uninflect' title='1'><mark>seems</mark></a> to <a href='been_done' title='2'><mark>have</mark></a> been greatly developed because of an elongated lagena . The presence of a thin stapes ( an ear bone <a href='null_relcl' title='3'><mark>that</mark></a><a href='drop_aux' title='4'><mark>is</mark></a>rod @-@ like in reptiles ) , combined with a large eardrum <a href='uninflect' title='5'><mark>implies</mark></a> the existence of a sensitive middle ear . It is possible that hadrosaurid ears are sensitive enough to detect as much sound as a modern crocodilian . 
Comparisons between the scleral rings of Corythosaurus and modern birds and reptiles suggest that it may have been cathemeral , active throughout da day at short intervals . Tdasense of hearing in hadrosaurids , specifically such as Lophorhothon , also seem to done been greatly developed becuz of an elongated lagena . The presence of a thin stapes ( an ear bone rod @-@ like in reptiles ) , combined with a bigass eardrum imply thdaxistence of a sensitive middle ear . It is possible that hadrosaurid ears r sensitive enough to detect as much sound as a modern crocodilian .