Imwe yenyaya dzekutanga dzakanyorwa pamusoro peIguanodon yaive yekuti yaive nemazino echikara chinodya zvirimwa, kunyangwe hazvo pasina nguva dzose kubvumirana pamusoro pekuti yaidya sei. Sezvakacherechedzwa naMantell, zvisaririra zvaakashanda nazvo zvaive zvisina kufanana nechero chipembenene chemazuva ano, kunyanya muchimiro chisina mazino, chakaita se scoop chechigunwe chepasi, icho chaakawana chakanakisa achienzaniswa neicho cheiyo sloth ine zvigunwe zviviri uye sloth yakatsakatika Mylodon. Akataurawo kuti Iguanodon yaive nerurimi rwekutanga rwaigona kushandiswa kuunganidza chikafu, senge giraffe. Zvimwe zvakasara zvakaratidza kuti uku kwaive kukanganisa; semuenzaniso, hyoid mapfupa ayo rurimi rwunotsigirwa zvakanyanya, zvichiratidza muscular, isinganzwisisike rurimi rwekudya muchipfuva. Rurimi rwekumashure-rwakapetwa rwakapihwawo kune chero chimiro chemazuva ano chechipembere, iyo yaakaona yakanakisa kuenzanisa neyakashandiswa kuungan
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