 Corythosaurus casuarius is one of a few lambeosaurines , along with Lambeosaurus lambei , Hypacrosaurus stebingeri and H. altispinus , to have had surviving fossilized juveniles assigned to it . Juveniles are harder to assign to species , because at a young age they lack the distinctive larger crests of adults . As they age , lambeosaurine crests tend to grow and become more prominent come maturity . In the Dinosaur Park Formation , over fifty articulated specimens have been found , coming from many different genera . Among them , juveniles are hard to identify at the species level . Earlier , four genera and thirteen species were recognized from the formation 's area , when paleontologists used differences in size and crest shape to differentiate taxa . The smallest specimens were identified as Tetragonosaurus , now seen as a synonym of Procheneosaurus , and the largest skeletons were called either Corythosaurus or Lambeosaurus ; an adult was identified as Parasaurolophus . Small lambeosaurines from the Horseshoe Canyon Formation were referred to Cheneosaurus . 
 Corythosaurus casuarius <a href='drop_aux' title='1'><mark>is</mark></a>one of a few lambeosaurines , along with Lambeosaurus lambei , Hypacrosaurus stebingeri and H. altispinus , to <a href='been_done' title='2'><mark>have</mark></a> had surviving fossilized juveniles assigned to it . Juveniles <a href='drop_aux' title='3'><mark>are</mark></a>harder to assign to species , because at a young age they lack the distinctive larger crests of adults . As they age , lambeosaurine crests tend to grow and become more prominent come maturity . In the Dinosaur Park Formation , over fifty articulated specimens <a href='been_done' title='4'><mark>have</mark></a> been found , coming from many different genera . Among them , juveniles <a href='drop_aux' title='5'><mark>are</mark></a>hard to identify at the species level . Earlier , four genera and thirteen species <a href='uninflect' title='6'><mark>were</mark></a> recognized from the formation <a href='null_genetive' title='7'><mark>'s</mark></a>area , when paleontologists used differences in size and crest shape to differentiate taxa . The smallest specimens <a href='uninflect' title='8'><mark>were</mark></a> identified as Tetragonosaurus , now seen as a synonym of Procheneosaurus , and the largest skeletons <a href='uninflect' title='9'><mark>were</mark></a> called either Corythosaurus or Lambeosaurus ; an adult was identified as Parasaurolophus . Small lambeosaurines from the Horseshoe Canyon Formation <a href='uninflect' title='10'><mark>were</mark></a> referred to Cheneosaurus . 
Corythosaurus casuarius one of a few lambeosaurines , along with Lambeosaurus lambei , Hypacrosaurus stebingeri and H. altispinus , to done had surviving fossilized juveniles assigned to it . Juveniles harder to assign to species , because at a young age they lack da distinctive larger crests of adults . As they age , lambeosaurine crests tend to grow and become more prominent come maturity . In the Dinosaur Park Formation , ova fifty articulated specimens done been found , commin from many diffrent genera . Among them , juveniles hard to identify at the species level . Earlier , 4 genera and thirteen species was recognized from the formation  area , when paleontologists used differences in size and crest shape to differentiate taxa . Tdasmallest specimens was identified as Tetragonosaurus , now seen as a synonym of Procheneosaurus , and thdaargest skeletons was called either Corythosaurus or Lambeosaurus ; an adult was identified as Parasaurolophus . Small lambeosaurines from the Horseshoe Canyon Formation was referred to Cheneosaurus .