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Aurochs were the first animal to go extinct by human effect. That was caused because humans even in the early years invaded lots of animals land and killed them to get food or other things. The aurochs was one of the animals that the cave people liked to hunt the most for lots of reasons and while they were already fragile it got worse. In 1627 the Aurochs were confirmed as extinct.

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The Dodo was one of the animals that got extinct pretty fast when humans arrived on the islands. Dodos were found by Dutch soldiers that were around on an island that dodos lived on. These islands were found in the Indian Ocean. The Dodo became extinct less than 80 years later because of deforestation, poaching, and destruction of the dodos nests by animals brought to the island by the Dutch. The Dodo may not  have always been flightless, but also was not as strong to fight the invasive species, the Dutch poachers and the Dutch loggers. Dodos used to live in Mauritius but even there they became extinct. Still the dodo is a well known symbol to the Mauritius people. The last dodo was killed in 1662 but scientists still think that dodos went extinct around 1690.

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The Steller's sea cow species went extinct by hunters in the 18th century less than 30 years after they were first discovered by Arctic explorers. The last sea cow was killed in  1768 on Bering Island by a poacher.

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For centuries, the penguin-like birds were popular as meat and bait. Their fat eggs, and feathers were sold as commercial goods. By the 1770s, overhunting threatened more and more of the species. On July 3, 1844, fishermen killed the last confirmed pair of great auks at Eldey Island, Iceland, leaving behind only memories of the auks before they went extinct.

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Labrador duck vanished nearly 150 years ago. The reason for the Labrador duck's extinction is still unknown, though there are several guesses as to why they are extinct. It is estimated that due to a specialized diet, the ducks were vulnerable when it came to adapting to their environment. It is also believed that an overharvest of birds and eggs on the ducks breeding grounds were a possible reason for extinction. Some people believe that the extinction could have been caused by the feather trades. There could have also been a decline in mussels and other shell creatures that the ducks ate, causing more chance of extinction. It is also possible that the enormous amounts of humans taking over the coasts caused the ducks to flee to find another habitat. However, the Labrador ducks group was limited to the American coast of the North Atlantic, which made it difficult for them to change habitat. Although there are many guesses as to how they went extinct, it is still not determined what the real cause was. The last seen Labrador duck was seen in Long Island in 1875. It is now preserved in the United States National Museum in Washington. They went extinct in the late nineteenth century.

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The Pere David's deer were once found only in China along the central and lower Yangtze River. But, years of overhunting and loss of its wetland habitat led to the extinction of the species in the wild in the early 20th century.  By 1910, in the heat of the Boxer Rebellion, the last remaining deer were killed by European troops occupying the imperial hunting grounds. And that was the end of the Père David's Deer in China.

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On the 1st September 1914, the last known passenger pigeon, a female named Martha, died at the Cincinnati Zoo.  She was roughly 29 years old and had palsy (The weakness or problems in the muscles ). Not once in her life had she laid a fertile egg.

2014 marked the 100th anniversary of the passenger pigeon’s extinction. It led the way to rousing public interest in the need for strong conservation laws. Because if these laws had been put into effect earlier, we could have saved many other species of our migratory birds and wildlife from extinction.

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The last known wild specimen was killed in Okeechobee County, in Florida, in 1904, and the last captive bird died at the Cincinnati Zoo on February 21, 1918. This was the male specimen, called "Incas", who died within a year of his mate, "Lady Jane". Coincidentally, Incas died in the same aviary cage in which the last Passenger Pigeon, "Martha", had died nearly four years earlier. It was not until 1939, however, that it was determined that the Carolina Parakeet had become extinct.

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On 7 September 1936 only two months after the species was guaranteed the title of protected specie, the last known thylacine died from exposure at Beaumaris Zoo in Hobart, Australia.

It is estimated there were around 5,000 thylacines in Tasmania at the time of the European settlement. However, overhunting, combined with problems such as habitat destruction, introduced of disease and invasive species led to the rapid extinction of the species.

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There are several reasons why the Bali Tiger species was very probable to extinction. First of all, their population was originally small, so removing a small amount of individuals has much more impact than if that same number was removed from a larger population. Also, these tigers lived on an island, which a lot more increased their chance of extinction. When humans began to populate the island of Bali, the tiger’s didn’t have anywhere to move to, they were trapped.

Tigers also had both aesthetic ( having a sense of the beautiful, characterized by a love of beauty. relating to, involving, or concerned with strong emotion and sensation as opposed to strong seriousness ) and commercial value. Killing tigers and selling their parts is a very lucrative business. Here are a few common tiger products:

Bones | $600/lb
Meat | $32-$40/lb
Blood | $80/bottle
Tail | $240 each
Head | $600 each
Tongue | $60 each
Penis | $2,400 each
Public Tiger Slaughter | $12,000

The Bali tiger was also a physically large animal, which can lead to several problems. First of all, this makes it much harder for them to hide from humans. Also, large animals require more land and resources in order to survive. Each individual tiger must maintain a large territory in order to obtain enough resources to survive. Most tigers have a territory of about 10-30 square miles each. Because the Bali tiger was smaller than the subspecies that exist today, its territory was probably slightly smaller, but this still does not allow for a very large population to survive on the small island.

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The wild population of Schomburgks deer is thought to have died out because of overhunting by 1932, with the last captive individual being killed in 1938. The species was listed as extinct in the 2006 IUCN Red List of Threatened Species. However, some scientists consider this species to be still in existence.

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Although the Toolache Wallaby was hunted for its beautiful pelt and for sport, the biggest factor in its decline was the extensive loss of it's habitat that resulted from the drainage and clearing of native vegetation.

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Barbary lions, also known as Atlas lions, are the largest lion species. An adult male weighs about 500 pounds and features a dark mane. The lions once roamed their native northern African homes (Morocco to Egypt) but were wiped out due to human activities. Many were killed by gladiators in Roman times. Hunting contributed to their extinction in the 19th and early 20th centuries. It’s believed Barbary lions went extinct in the wild in the 1960s.

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Caribbean Monk, the last confirmed sighting of the seal known as the Caribbean monk was in 1952 in the Caribbean Sea at Seranilla Bank, between Jamaica and the Yucatan Peninsula.

"Humans left the Caribbean monk seal population unsustainable after overhunting them in the wild", said Kyle Baker, biologist for NOAA’s Fisheries Service in the south eastern region.

“Unfortunately, this led to their demise and labels the species as the only seal to go extinct from human causes,” he said.

Caribbean Monk seals, Monachus tropicalis, were listed as endangered on March 11, 1967, under the Endangered Species Preservation Act, and relisted under the Endangered Species Act on April 10, 1979.

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Kazakhstan’s Caspian tiger was declared extinct 70 years ago after falling victim to habitat loss, systematic hunting by military troops and reduction of prey – mainly boar and Bukhara deer.

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The Socorro dove was at one time living in the wild but when humans came it got slowly worse for the Socorro dove. Cities where built and the Socorro dove was not like the pigeon we have in some parts of the world that live in cities, because the Socorro dove species was not meant to live in cities. It lived in the vast forests of the Revillagigedo Islands off the west coast of Mexico. Predation by feral cats and the introduction of sheep also caused a lot of its extinction. The last Socorro dove died when a sheep destroyed the last Socorro dove's nests.

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Starting in the 1700s, the maritime fur trade of the Pacific Northwest depleted nearly all species of marine mammals including sea otters, whales, dolphins, seals and sea lions.  Japanese Sea Lions were hunted almost to extinction for their oil-rich blubber, which was used to make oil for lamps and lubrication. In 1974 the Japanese Sea Lion went extinct because of habitat loss by pollution of the seas, oil spills and overfishing .

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Wyoming toads got extinct by habitat loss and deforestation. Since they live in the wetlands, they need the trees to keep them wet so as not to loose their water from the sun's evaporation. The second cause of the extinction of Wyoming toads is the chytrid fungus. It is a famous disease in the amphibian family that can cause immediate death to some Wyoming toads and a slower death to others. The cause of death in the majority of wild and captive toads from 1989 until 1996 appeared to be caused by the fungus Basidiobolus ranarum, another type of chytrid fungus.

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Golden Toads died of habitat loss of it's rainforest and wetlands but also climate change and the fungus disease . Finally, in 2004, the International Union for Conservation of Nature declared the Golden Toad “Extinct.”

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Dusky Seaside Sparrow. The last definite known individual died on Walt Disney World‘s Discovery Island in 1987. As a result, the subspecies was officially declared extinct in December 1990. The story of the last Dusky seaside sparrow and Disney began in 1983, when the group tried to save the last living birds of the species but failed.

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Scimitar Oryx. Due to human disturbance, over-hunting, drought and loss of food because of excessive livestock grazing, the scimitar-horned oryx is now extinct in the wild. Surveys show that Niger and Chad may have appropriate habitats for reintroducing the Schimitar Oryx to the wild. Some reintroductions have begun in Tunisia.

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The Hawaiian crow became extinct because humans introduced predators like cats, dogs, rats, and mongoose. While the Hawaiian crows already had other predators, it was too much for the crow. It became extinct in 2002 because there were too many predators in its territory.

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The Eastern Cougars were common throughout eastern North America until the late 1800s, when their populations began to drastically decline as forests and prey disappeared and European settlers killed them to protect their livestock and families.

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The rarest of the black rhino species, the Western Black Rhino was officially declared extinct in 2011. Their extinction was caused mainly by poachers killing them for their horns, which are highly prized on the black market and used in traditional Chinese medicine.