bone-headed dinosaur
ornithopod
ornithopod dinosaur
genus Triceratops
genus Protoceratops
genus Ankylosaurus
hadrosaurian
compsognathus
family Titanosauridae
genus Styracosaurus
Titanosauridae
iguanodon
ceratosaur
suborder Ceratopsia
Ceratopsia
ceratosaurus
necrosaurid
megalosaurus
megalosaur
genus Apatosaurus
psittacosaur
psittacosaurus
hadrosaurus
hadrosaur
duck-billed dinosaur
carnosaur
protoceratops
genus Brontosaurus
genus Stegosaurus
pachyrostran
genus Phrynosoma
Phrynosoma
monstersaurid
iguanodontian
archeopyle
deinonychus
helodermatid
archosauromorph
chamaeleontid
macronarian
dinosauric
crocodilian reptile
order Ornithischia
archaeobatrachian
crocodilian
melanorosaurid
Ornithischia
family Dromaeosauridae
spadefoot
South American poison toad