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Disappearing around 9,000 years ago, the lack of adequately-sized food was nothing to grin at for this ferocious feline.
Smilodon or Saber-toothed cat (if no one can get the proper name)

The largest bird in African history, this Malagasy avian was a browsing herbivore gone with deforestation.
Elephant Bird
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Hunted and predated to extinction by the Dutch and their pets in the 1600s, these flightless birds are synonymous with stupidity
Dodo
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Going extinct due to the advent of modern firearms, this starry ursid inhabited parts of the Ottoman Empire until 1834.
Atlas Bear/North African Brown Bear
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This bird, once endemic to North America, had a name referring to its migratory patterns of 'passing by'. Here is a photo of the last known specimen, Martha, on display at the Smithsonian Museum of Natural History.
Passenger Pigeon
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Disappearing around 11,000 years ago, this large land mammal's name means literally 'Breast Tooth'
Mastodon
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Going extinct during the decline of the Roman Empire in 370, aridification of Algeria and Libya probably was the downfall of this petite pachyderm.
The North African Elephant

Hunted to extinction in the Atlantic in the 1700s, this species of Marine Mammal still inhabits the Northern Pacific
The Grey Whale
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Depicted here by the great James Audubon, these birds similar to ducks inhabited much of the American and European Atlantic Coast
Great Auk

The only species of parrot native to the USA, this colorful parakeet went extinct in 1918 due to hunting and competition with bees.
Carolina Parakeet

Going extinct around 12,000 years ago, this group was made up the largest land mammals in history, reaching 22 feet tall.
Giant Ground Sloths

Hunted to extinction in the 15th century by the newly-arrived Māori People, this New Zealand bird was the largest to live alongside humans.
Moa
This was the number one cause of extinction during the period of colonial Empires.
Predation and competition by introduced species (rats, cats, etc.)
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Going extinct shortly after it's namesake's famous Galapagos visit, this big bird died due to introduced predators on the canopy floor.
Darwin's Large Ground Finch
Apart from humans, approximately how many Great Ape individuals remain on Earth?
About half a million, all of which are critically endangered.
This massive species, long thought to have died out with the Ice Age, actually existed on an isolated island in present-day Russia until around 1700 BCE.
Wooly Mammoth
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Dying out due to the overhunting of its prey, the largest predatory bird in human history made a faast departure
Haast's Eagle
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Hunted to extinction in South Africa at the end of the 18th century, this colorfully named cervid must have been saddened by its fate.
Bluebuck

A strange hybrid of Zebra and Horse? Not at all, this distinct equid (who's only photographed living specimen is placed here) was native to South Africa.
Quagga

Dying out in 2002, this extinct species of cetacean swam throughout the Yangtze.
Chinese River Dolphin

Ancestors to modern-day armadillos, this large, shelled mammal went extinct right as humans arrived in South America.
Glyptodon
One of the first examples of human-caused plant extinction, this bush went extinct due to the introduction of rats on [Easter Island] in 1650.
Rapa Nui Palm
An example of consequential imbalance, this sirenian went extinct as a result of a reduction of kelp as a result of sea otter hunting in Kamchatka, which caused proliferation of kelp-eating sea urchins. This led to loss of hiding from being hunted.
Stellar's Sea Cow

This species of Canine was hunted to extinction via a furious campaign by the Japanese government in the 1860s following a number of horse killings.
Ezo Wolf or Hokkaido Wolf
Approximately how many species go extinct every year?
~8,000 (though some estimates range from 2,000 to 15,000)