Seven beautiful animals we cannot see now

We may think of the extinction of a species as a sudden but occasional event, but the reality is that extinction is alarmingly normal.

According to the World Wildlife Fund for Nature (WWF), about 10,000 species become extinct each year.

But the WWF says the exact number is not known because we do not yet know how many species there are around the world.

Let's take a look at some of the animals that became extinct from  this planet and also see which of them came back in a surprising and unexpected way.

1: Yangtze River Dolphin

Scientific name: Lipotes vexillifer

Kingdom: Animalia

Phylum: Chordata

Class: Mammalia

Order: Artiodactyla

Infraorder: Cetacea

Clade: Delphinida

Superfamily: Lipotoidea

Family: Lipotidae

Genus: Lipotes Miller, 1918 

Species: L. vexillifer

 The Yangtze River dolphin, which became extinct in 2006, was a pale gray mammal that looked relatively less powerful than its cousins ​​floating in the ocean.

Beneath its simple body was a highly evolved eco-location system that was far superior to that of other dolphins. Its system could work so closely that it could detect the location of even a single fish.

But that same sensitivity became a threat to him when the river was filled with fishing boats, container vessels, trailers and man-made pollution.

Panicked by the heavy traffic, the Yangtze River dolphin had no option but to survive.

2: Caribbean Monk Seal

Scientific name: †Neomonachus tropicalis

Kingdom: Animalia

Phylum: Chordata

Class: Mammalia

Order: Carnivora

Clade: Pinnipediformes

Clade: Pinnipedia

Family: Phocidae

Genus: Neomonachus

Species: †N. tropicalis

This native Caribbean hippopotamus was once found on the eastern coast of Central America, the northern shores of South America, and the Gulf of Mexico.

But they were ruthlessly hunted for the oil found in their fat, while their prey of the fish that became their food ran out of food for the surviving hippopotamus.

They were last seen in 1952 near the Sierra Leone between Jamaica and Nicaragua.

3: Alabama Pigtoe

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Scientific name: Pleurobema johannis

Kingdom: Animalia

Phylum: Mollusca

Class: Bivalvia

Order: Unionida

Family: Unionidae

Genus: Pleurobema

Species: P. johannis

This innocent looking oyster was found in the Mobile River in the US state of Alabama until 2006. It got its name because it looked like a pig's foot, but it filtered the polluted river water. But the pollution became so high that Pagtu could no longer find it.

The extinction of this tiny creature has uncovered many bitter truths about water, which is being contaminated with toxic substances from factories and causing deadly diseases in the African American community living along the river.

4: Dodo

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Scientific name: †Raphus cucullatus

Kingdom: Animalia

Phylum: Chordata

Class: Aves

Order: Columbiformes

Family: Columbidae

Subfamily: †Raphinae

Genus: †Raphus Brisson, 1760

Species: †R. cucullatus

It may be a strange privilege to be the most famous but endangered bird, but apart from the dinosaurs, the dodo is a long-extinct species that everyone knows.

This bird, which looks like the cartoon character Defy Dick, used to live on the island of Mauritius. There were no predators in the nature of this flying bird.

When man arrived in Mauritius, he brought with him his appetite for other animals and meat. Dudu could not stay in front of them for long.

The last dodo died in the early 18th century.

5: Steller's Sea Cow

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Scientific name: †Hydrodamalis gigas

Kingdom: Animalia

Phylum: Chordata

Class: Mammalia

Order: Sirenia

Family: Dugongidae

Genus: †Hydrodamalis

Species: †H. gigas

These sea cows look like Minati and Dogong, but they are much bigger than them. Steeler's sea cow could be up to nine meters in size.The steller sea cow was certainly the largest sirenian. Reaching a length of 9–10 metres (over 30 feet) and a weight of perhaps 10 metric tons (22,000 pounds), it was much larger than present-day manatees and dugongs. Like the dugong, the sea cow had a relatively small head and a broad, horizontal forked tail fluke. Small stumpy flippers near the front of the body were used for moving over rocky areas and for holding fast to rocks in rough seas. The barklike skin was dark brown, sometimes streaked or spotted with white. Sea cows had no teeth; instead, they relied on horny plates in the mouth to compact their soft food, which consisted of kelp and seaweed near the ocean’s surface along the shore. They floated at the surface but had little ability to submerge and thus were easy targets for harpooning by hunters. The sea cow was used to supply Russian seal hunters with prized meat on long sea journeys, and killing was often wasteful. The total population in 1741 has been estimated at about 2,000, but by 1768 it had been exterminated. The extinction of Steller’s sea cow is a dramatic example of the vulnerability of small isolated animal populations.

Due to its excellent shape, skin and precious fat, it has been a target of predators. It tasted like beef dipped in almond oil.

They are believed to have become extinct shortly after the extinction of the dodo due to hunting and changes in their diet.

6: Quagga

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Scientific name: Equus quagga quagga

Kingdom: Animalia

Phylum: Chordata

Class: Mammalia

Order: Perissodactyla

Family: Equidae

Genus: Equus

Species: E. quagga

Subspecies: †E. q. quagga

Quagga formerly found in vast herds on the great plains of South Africa but now extinct. The colour of the head, neck, and upper parts of the body was reddish brown, irregularly banded, and marked with dark brown stripes, stronger on the head and neck and gradually becoming fainter until lost behind the shoulder. There was a broad dark median dorsal stripe. The undersurface of the body, the legs, and the tail were nearly white, without stripes. The crest was high, surmounted by a standing mane, banded brown and white. The last known surviving quagga died in the London Zoo in 1872.Poor Quagga's extraordinary beauty was the cause of his extinction. The front half of this charming African animal was striped like a zebra, but the stripes would fade away at the back, and the back would be as simple and brown as a horse.

Due to its astonishing condition, it was so illegally hunted that it became extinct. The last of them died in captivity in the 1880s.

7: Irish Elk

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Scientific name: †Megaloceros giganteus

Kingdom: Animalia

Phylum: Chordata

Class: Mammalia

Order: Artiodactyla

Family: Cervidae

Subfamily: Cervinae

Genus: †Megaloceros

Species: †M. giganteus

Most of the endangered species were closer to the animals we know today, but just a little weird.

Consider, for example, the mammoth, which looked like a giant elephant covered in hair.

Though no one alive today has ever seen one in the flesh, the fossilized remains of this species give us a good estimation of what they looked like. They stood about 7 ft. tall at the shoulder, and their antlers were 12 ft. across.To carry such heavy antlers, it is likely they were incredibly muscular, particularly in their necks, chests, and backs. Scientists estimate that they weighed about as much as some modern-day moose, up to 1,500 lbs.They became extinct about 7,700 years ago, possibly due to hunting and changing weather.

2 Animals that recovered from extinction

1: White Tail Eagle

photo from pixabay.com

Scientific name: Haliaeetus albicilla

Kingdom: Animalia

Phylum: Chordata

Class: Aves

Order: Accipitriformes

Family: Accipitridae

Genus: Haliaeetus

Species: H. albicilla

White-tailed eagles were almost extinct in Britain in the early 20th century, but not for long.

With a wingspan of about two meters, this magnificent bird has been brutally hunted in the UK for many years.In fact, he would have been encouraged to kill.

By the time the killing of birds was outlawed, it was too late to stop the extinction.

But fortunately white-tailed eagles settled elsewhere in Europe and were able to reintroduce them to Britain.

 2: Miss Waldner's Red Colubus

Scientific name: Piliocolobus waldronae

Kingdom: Animalia

Phylum: Chordata

Class: Mammalia

Order: Artiodactyla

Infraorder: Cetacea

Clade: Delphinida

Superfamily: Lipotoidea

Family: Lipotidae

Genus: Lipotes Miller, 1918

Species: L. vexillifer

Miss Waldron’s Red Colobus came close to claiming the dubious honor of being the first primate to be declared extinct in more than 500 years after repeated failed searches. But evidence from hunters appeared in 2000 and 2001 that suggested that a very small number of these monkeys may be living in the southeast corner of Côte d'Ivoire. It was first discovered in 1933 by a British museum collector who named it after a colleague on the expedition, Miss F. Waldron, with the last conclusive sighting of the monkey in 1978.

Miss Waldner's Red Columbus, which lives on the border of Ghana and Ivory Coast, is one of the most amazing animals because it did not have thumbs.

This soft-spoken animal, which lives in large groups in the tops of tall trees, was forced to change its lifestyle due to deforestation by humans.

As the forests began to shrink, the groups of Red Colubs also became smaller, increasing their risk of predators, and genetic vulnerabilities began to develop due to interbreeding.