great auk
pleuropholid
three-toed sloth
extirpated
phyllolepid
Bradypus tridactylus
mylodon
peradectid
boreaspidid
imperiled
sparassocynid
vombatomorph
phytosaurian
mammaliamorph
aspidorhynchiform
genus Protoavis
genus Archaeornis
plesiadapiform
archaeocete
kioea
palaeoryctid
caprinid
dodo
eosauropterygian
anchithere
mahajangasuchid
Raphus cucullatus
paleozoology
eptatretus
maradid
louisinid
elephant bird
Tympanuchus cupido cupido
pantolest
heath hen
palaeozoology
clevosaurid
aepyornis
eriptychiid
Belemnoidea
dinornithiform
solitaire
zoolite
yalkaparidontid
Pezophaps solitaria
order Belemnoidea
prophaethontid