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