 One of the first details noted about Iguanodon was that it had the teeth of a herbivorous reptile , although there has not always been consensus on how it ate . As Mantell noted , the remains he was working with were unlike any modern reptile , especially in the toothless , scoop @-@ shaped form of the lower jaw symphysis , which he found best compared to that of the two @-@ toed sloth and the extinct ground sloth Mylodon . He also suggested that Iguanodon had a prehensile tongue which could be used to gather food , like a giraffe . More complete remains have shown this to be an error ; for example , the hyoid bones that supported the tongue are heavily built , implying a muscular , non @-@ prehensile tongue used for moving food around in the mouth . The giraffe @-@ tongue idea has also been incorrectly attributed to Dollo via a broken lower jaw . 
 One of the first details noted about Iguanodon was that it had the teeth of a herbivorous reptile , although <a href='dey_it' title='1'><mark>there</mark></a> <a href='uninflect' title='2'><mark>has</mark></a> <a href='negative_concord' title='3'><mark>not</mark></a>always <a href='negative_concord' title='4'><mark>been</mark></a> <a href='negative_concord' title='5'><mark>consensus</mark></a> on how it ate . As Mantell noted , the remains he was working with <a href='uninflect' title='6'><mark>were</mark></a> unlike any modern reptile , especially in the toothless , scoop @-@ shaped form of the lower jaw symphysis , which he found best compared to that of the two @-@ toed sloth and the extinct ground sloth Mylodon . He also suggested that Iguanodon had a prehensile tongue which could be used to gather food , like a giraffe . More complete remains <a href='been_done' title='7'><mark>have</mark></a> shown this to be an error ; for example , the hyoid bones <a href='null_relcl' title='8'><mark>that</mark></a>supported the tongue are heavily built , implying a muscular , non @-@ prehensile tongue used for moving food around in the mouth . The giraffe @-@ tongue idea <a href='been_done' title='9'><mark>has</mark></a> also been incorrectly attributed to Dollo via a broken lower jaw . 
One of da first details noted bout Iguanodon was that it had tdateeth of a herbivorous reptile , although it have always ain't no consensus on how it ate . As Mantell noted , the remains he was working with was unlike any modern reptile , especially in thdaoothless , scoop @-@ shaped form of the lower jaw symphysis , which he found best compared to that of the 2 @-@ toed sloth and the extinct ground sloth Mylodon . He also suggested dat Iguanodon had a prehensile tongue which could be used to gather food , like a giraffe . More complete remains done shown this to be an error ; for example , the hyoid bones supported thedangue are heavily built , implying a muscular , non @-@ prehensile tongue used fa moving food around in the dath . The giraffe @-@ tongue idea done also been incorrectly attributed to Dollo via a broken lower jaw .