http://www.ranker.com/list/10-most-amazing-extinct-animals/michellemckat,
Tyrannosaurus Rex (extinct 65 million years ago)
Thylacine: the Tasmanian Tiger (extinct since 1936)
Quagga: half zebra, half horse (extinct since 1883)
Irish Deer: the largest deer that ever lived (extinct about 7,700 years ago)
Steller's Sea Cow: the defenseless beast (extinct since 1768)
Aurochs: a very large type of cattle (extinct since 1627)
Caspian Tiger: the third largest (extinct since 1970)
Cave Lion: one of the largest lions ever (extinct 2,000 years ago)
Dodo: the archetype of extinct species (extinct since late 17th century)
Great Auk: largest of all auks (extinct since 1844)