 The thumb spike is one of the best @-@ known features of Iguanodon . Although it was originally placed on the animal 's nose by Mantell , the complete Bernissart specimens allowed Dollo to place it correctly on the hand , as a modified thumb . ( This would not be the last time a dinosaur 's modified thumb claw would be misinterpreted ; Noasaurus , Baryonyx , and Megaraptor are examples since the 1980s where an enlarged thumb claw was first put on the foot , as in dromaeosaurids . ) 
 The thumb spike <a href='drop_aux' title='1'><mark>is</mark></a>one of the best @-@ known features of Iguanodon . Although it was originally placed on the animal <a href='null_genetive' title='2'><mark>'s</mark></a>nose by Mantell , the complete Bernissart specimens allowed Dollo to place it correctly on the hand , as a modified thumb . ( This would <a href='negative_concord' title='3'><mark>not</mark></a><a href='negative_concord' title='4'><mark>be</mark></a> the last time a dinosaur <a href='null_genetive' title='5'><mark>'s</mark></a>modified thumb claw would be misinterpreted ; Noasaurus , Baryonyx , and Megaraptor are examples since the 1980s where an enlarged thumb claw was first put on the foot , as in dromaeosaurids . ) 
The thumb spike one of da best @-@ known features of Iguanodon . Although it was originally placed on the animal  nose by Mantell , tdacomplete Bernissart specimens allowed Dollo to place it correctly on the hand , as a modified thumb . ( This would ain't thdaast time a dinosaur  modified thumb claw would be misinterpreted ; Noasaurus , Baryonyx , and Megaraptor are examples since the 1980s where an enlarged thumb claw was first put on the foot , as in dromaeosaurids . )