 In 1849 , a few years before his death in 1852 , Mantell realised that iguanodonts were not heavy , pachyderm @-@ like animals , as Owen was putting forward , but had slender forelimbs ; however , his passing left him unable to participate in the creation of the Crystal Palace dinosaur sculptures , and so Owen 's vision of the dinosaurs became that seen by the public for decades . With Benjamin Waterhouse Hawkins , he had nearly two dozen lifesize sculptures of various prehistoric animals built out of concrete sculpted over a steel and brick framework ; two iguanodonts ( based on the Mantellodon specimen ) , one standing and one resting on its belly , were included . Before the sculpture of the standing iguanodont was completed , he held a banquet for twenty inside it . 
 In 1849 , a few years before his death in 1852 , Mantell realised that iguanodonts <a href='negative_concord' title='1'><mark>were</mark></a> <a href='negative_concord' title='2'><mark>not</mark></a>heavy , pachyderm @-@ like animals , as Owen was putting forward , but had slender forelimbs ; however , his passing left him unable to participate in the creation of the Crystal Palace dinosaur sculptures , and so Owen <a href='null_genetive' title='3'><mark>'s</mark></a>vision of the dinosaurs became that seen by the public for decades . With Benjamin Waterhouse Hawkins , he had nearly two dozen lifesize sculptures of various prehistoric animals built out of concrete sculpted over a steel and brick framework ; two iguanodonts ( based on the Mantellodon specimen ) , one standing and one resting on its belly , <a href='uninflect' title='4'><mark>were</mark></a> included . Before the sculpture of the standing iguanodont was completed , he held a banquet for twenty inside it . 
In 1849 , a few yrs before his death in 1852 , Mantell realised dat iguanodonts ain't heavy , pachyderm @-@ like animals , as Owen was putting forward , but had slender forelimbs ; however , his passing left him unable to participate in the creation of the Crystal Palace dinosaur sculptures , and soo Owen  vision of da dinosaurs became that seen by the public for decades . With Benjamin Waterhouse Hawkins , he had nearly two dozen lifesize sculptures of various prehistoric animals built out of concrete sculpted ova a steel and brick framework ; two iguanodonts ( based on the Mantellodon specimen ) , one standin and one resting on its belly , was included . Before tdasculpture of the standing iguanodont was completed , he held a banquet for twenty inside it .