Which animals will be extinct by 2021?
It is quite normal for new animal species to develop and others to become extinct. If species cannot adapt quickly enough to the new environmental conditions, individual populations gradually die out, then individual subspecies and with them the last representatives of the entire species. It is estimated that 99.9% of all animals and plants that have ever existed are extinct. In modern times, humans are a common cause of animal extinction - directly through hunting and indirectly, for example through habitat destruction. According to the IUCN (International Union for Conservation of Nature), a total of 84 species of mammals and 159 species of birds extinct.
Recently Extinct Animals: Animals extinct since 2000
Some animals have also disappeared from the earth in recent years. We would now like to introduce a few of them to you:
1. The sword sturgeon
The sword sturgeon is the first species to appear in the year 2020 is extinct, or was declared extinct this year. The giant fish originally lived in the Chinese Yangtze River and could grow up to three meters long become.
No sword sturgeon has been seen since 2003, attempts to track one continued until 2018. In vain. By severe overfishing in the second half of the 20th century and the Fragmentation of its habitat it became increasingly rare. When the construction of a hydroelectric power station prevented the sturgeons from migrating to their spawning areas, their end was virtually sealed.
The sword sturgeon was a special fish not only because of its size. It was also the only representative of its genus. It is now extinct with him.
2. Christmas Island Forest Skink
The Christmas Island forest skink lived on the Australian Christmas Island. Already in 1998 it was noticed that the population of the lizard sank, 12 years later no more wild Christmas Island forest skink was seen. The last one in captivity died in 2014. 2017 the species was declared extinct.
Apparently responsible for the extinction of this lizard was the Yellow spinner ant, an invasive species, as well as the Habitat loss by mining.
Also: Another resident of Christmas Island disappeared forever in the past few years: The Christmas Island Pipebat. It has also been in effect since 2017 as extinct. However, the reasons for this are unclear.
3. Pinta giant tortoise
Many different turtle subspecies live in the Galapagos Islands. Because they live on different islands, their genetic makeup has separated over time, so that they can no longer mate. 2016 the giant pinta tortoise has been declared extinct. It only occurred on the island of Pinta. The turtle"Lonesome George" was the last representative of the species. Attempts have been made in vain to cross it with turtles from other Galapagos Islands. The animals were used forFood production killed. Also fed introduced rats from the turtle eggs.
4. Bramble-Cay mosaic tail rat
The Bramble-Cay mosaic-tailed rat was 2016 declared extinct. It lived on a small coral island in the Great Barrier Reef (Australia) and is apparently one of the first animals whose extinction directly affected the Climate change is due: Regular Floods destroyed the habitat of the mosaic tail rat.
5. Chinese river dolphin
The Chinese river dolphin, too Youngster Dolphin or Baiji called, is the first species of dolphin to become extinct due to humans. She lived in the Chinese river Yangtze, the third largest river in the world. It is one of the most polluted rivers in the world. Last but not least, this strong one pollution became the doom of the Chinese river dolphin. Since the year 2007 it is assumed that it is extinct after it was no longer found on expeditions lasting several weeks in 2006.
6. Golden toad
The distribution of the golden toad was limited to a few kilometers in Costa Rica at altitudes of about 1,500 to 1,600 meters. The golden toad has not been observed since 1989 and since 2004 it is considered "extinct" according to the IUCN Red List. The main cause of the disappearance of the species is in the Infection with chytridiomycosis seen one of the most devastating infectious diseases within amphibian populations.
The increased outbreak of infection is also due to the global warming returned. In Central and South America in particular, the greenhouse effect creates favorable growth conditions for the chytrid fungus.
Animal species extinct in the 20th century
Some animals have also disappeared from the earth in the past hundred years.
1. Extinct tiger species
Of the total of eight subspecies of the tiger are already today three extinct, one has not been seen for 30 years (source: WWF):
- Bali tiger: Extinct since the 1930s
- Caspian tiger: Extinct in the 1950s
- Java Tiger: Extinct in the 1950s
- South China Tiger: Last seen in the 1990s
To date, around 95 percent of tiger habitats have been destroyed. Because of its fur and bones, which are coveted as trophies or for traditional medicine in Asia, the tiger is still hunted today. Today, all of the remaining five subspecies of the tiger are critically endangered or critically endangered.
2. Tasmanian tassel wolf
The dog-like marsupial species with a tiger-like stripe on the back area was also known as the "Tasmanian tiger". It had a reputation as a bloodthirsty nocturnal hunter because it usually smashed the prey's skull with its powerful claws and also stole carcasses from traps.
At first he also lived on the Australian mainland, but then became of the more undemanding dingo more and more suppressed until it finally only appeared on the island of Tasmania. Here he became special from 1850 because of his nocturnal raids hunted by sheep farmers and the inventory was falling rapidly.
since 1936 the Tasmanian thylacine is considered extinct, but sightings are reported again and again. In 1961, an animal is said to have been killed in an accident. However, these findings have never been confirmed.
3. American passenger pigeon
It is almost always a constellation of several factors that ultimately lead to the extinction of a species. These reasons have been extremely well researched in the American passenger pigeon. The fate of this bird species took place in the course of the settlement and economic development of North America by the Europeans. 1914 the last pigeon died as a cage bird in the zoo of Cincinatti, while the last wild animal already died 1899 was captured. The primary cause of extinction was that excessive hunting for the meat of the pigeons. The species, which once numbered billions of individuals, was reduced to a few thousand animals.
Despite this relatively large population, the population did not recover. The birds faced several new threats: Paths intensive deforestation It became more and more difficult for them to find suitable nesting sites. In socially breeding species such as the pigeon, which often brooded by the hundreds on a tree, the presence of conspecifics has a stimulating effect on the breeding business. With an already drastically reduced inventory the number of offspring also decreased, because single pairs no longer got into breeding mood. The decimated population was also more susceptible to predators and diseasesso that the species died out.
4. New Zealand tuberous weevil
1910 the weevil, up to 3 cm in size, died out. The Introducing rats to New Zealand by humans was the main cause of the extinction of these insects. Rats ate the beetles until the species with the last individual became extinct.
Animal species that became extinct even earlier
More extinct animals from the past centuries. Humans are responsible for the extinction of these animals.
The quagga lived in the grassland areas of South Africa and was one Zebra shape. It was yellow-brown, but only had stripes on the head, neck and chest. Countless quaggas lived in South Africa in the 17th century and were among the most common large mammals of this time. Then it began intensive hunting for different reasons like Leather, meat, and "sport". In addition, many colonialists saw the quaggas as Food competitors of their cattle. In the wilds of the African deserts, the quaggas died in the late 1870s out. The last individuals in captivity died 1883 in a zoo in Amsterdam.
The giant alk is a flightless sea bird. Its plumage was black and white, similar to that of a penguin. However, he lived on islands in the northern hemisphere North Atlantic (e.g. Funk Island, Farorers, Islands off Iceland ...). They mostly stayed in the water and used the rocky cliffs as a breeding and resting place. A single egg was laid without a nest on hard-to-reach rock edges.
The giant alks were primarily because of them Down and fat bones (as fuel) slain with clubs. Due to the low rate of reproduction the stocks could not recover. The killing of the birds was so widespread that the birds were eventually only found on one island off Iceland. The last two giant alks were im June 1844 strangled and crush the last egg.
3. Steller's manatee
The German researcher Georg Wilhelm Steller discovered the giant manatees by chance on an expedition from the Siberian coast to Alaska in 1741. The manatees, which are related to the elephants, reached one Length of 8 meters and were therefore larger than their tropical relatives. Within 27 years Fur hunters killed the manatees around the Bering IslandFood productionand so exterminated them. In the year 1768 the last of their kind were slain.
The aurochs, also called Ur, is one of the most famous extinct animal species. Our ancestors drew his silhouette on cave walls and hunted animals up to two meters high. Domestication and breeding through man since the Stone Age led the aurochs to the cattle breeds known today.
But domestication was of no use to the vigorous, wild species: it died 1627 out. Since the 20th century people have tried again and again to breed back an auroch-like cattle from our domestic cattle. Even if the appearance of a breed of cattle would look similar to the aurochs after such breeding, is the genetic material of the real aurochs is now lost forever with its extinction.
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