Struthioniformes
order Struthioniformes
order Rheiformes
Rheiformes
order Dinornithiformes
Dinornithiformes
genus Protoavis
order Casuariiformes
Casuariiformes
genus Archaeornis
archeopteryx
archaeopteryx
Archaeopteryx lithographica
genus Ibero-mesornis
paleornithology
protoavis
genus Archeopteryx
genus Archaeopteryx
struthionine
starling
palaeornithology
family Struthionidae
Struthionidae
Archaeornithes
subclass Archaeornithes
Paleocene
Paleocene epoch
ornithology
Apterygiformes
order Apterygiformes
order Ornithischia
Ornithischia
Gaviiformes
order Gaviiformes
Ratitae
superorder Ratitae
Aves
Psittaciformes
class Aves
struthious
Ictodosauria
velociraptor
Titanosauridae
order Ictodosauria
Falconidae
family Casuaridae
Casuaridae
Raptores
order Raptores
family Falconidae
order Psittaciformes
family Titanosauridae
Uintatheriidae
ornithomimosaurian
genus Gyps
hesperornithiform
choristodere
family Uintatheriidae
Cygnus
Phaethontidae
diatryma
ornithichnite
pantodontan
genus Cygnus
jungle fowl
Gyps
fourchette
family Phaethontidae
gallina
reedling
order Sauropterygia
Sauropterygia
bird genus
avisaurid
avialan
Sinornis
Himalayan griffon vulture
genus Antrodemus
cathartid
Phasianidae
family Turnicidae
typotherian
Turnicidae
tickleass
genus Cepphus
acanthostegid
family Phasianidae
genus Allosaurus
pantodont
archaeoentomological
Ichthyosauria
order Ichthyosauria
Cepphus
New World vulture
avialian
Dromaius
psittacine
genus Dromaius