Extinction is the termination of a kind of organism or of a group of kinds, usually a species. The moment of extinction is generally considered to be the death of the last individual of the species. We're in the midst of the sixth great extinction right now, with the rise of humans behind the unprecedented rise in the rate at which we're losing species. Some of these extinct species are lost forever, while others are part of de-extinction projects. Each one of them is are worth learning about and remembering.
One species disappears leaving behind another more evolved one. The original species (ancestor) is considered to be extinct but its lineage continues. There is no increase or decrease in diversity.
A species becomes extinct without leaving descendants. Diversity therefore decreases.This type is in turn subdivided into two:
Here is the sample list of few Extinct Animals by Year:
The below said most famous list of animals of Seven Continents may be extinct in the future due to Phyletic extinction or Terminal extinction.
Wikimedia Commons User:FlyOpenSkies / CC-BY-SA-3.0
The thylacine also known as the Tasmanian Tiger. It is a dog-like animal except for it's ability to stretch its jaws up to great lengths. They were native to the Australian mainlands, and Tasmania. They went extinct in 1936, with many people believing the cause were hunters, but humans coexisting with them messed up their habitat which could have led to them dying off. However, Fencing workers in Lang Lang supposedly spotted a Thylacine one morning in 1979, and there were more apparent sightings later on.
Wikimedia Commons User: US Fish & Wildlife Service / CC-BY-SA-3.0
In many ways, the golden toad is an iconic species when it comes to extinction. Only described to science in 1966, and once abundant in a 30-square-mile area of the cloud forest above Monteverde, Costa Rica, none of these two-inch-long toads have been sighted since 1989. The reason for its sudden extinction is not known conclusively, but habitat loss and chytrid fungus are likely culprits. Regional weather changes brought about by El Niño conditions are also suspected to have played a role in killing off the last of the golden toads.
putneymark / Flickr / CC BY-SA 2.0
The Pinta Island tortoise, a subspecies of the Galápagos tortoise, may be the most recent large animal to be declared extinct. The last of the line, a male dubbed Lonesome George and who was more than 100 years old, died on June 24, 2012, from heart failure. The species had been presumed extinct by the middle part of the 20th century, with the large majority of them killed by the end of the 19th century, but in 1971 George was discovered. In addition to hunting by humans, the introduction of non-native species such as goats contributed to habitat loss, leading to the demise of the tortoise.
Wikimedia Commons User: Ermell / CC-BY-SA-4.0
Only one quagga was ever photographed, a female at the London Zoo in 1870. In the wild, the quagga was found in great numbers in South Africa. However, the quagga was hunted to extinction for meat, hides, and to preserve feed for domesticated animals. The last wild quagga was shot and killed in the 1870s, and the last one held in captivity died in August of 1883.
Wikimedia Commons User: KKPCW / CC-BY-SA-4.0
One of four subspecies of the Spanish Ibex or Iberian Goat that was found in the Iberian Peninsula. The Ibex would grow to a height of 60-76cm at the shoulder and weigh 24-80 kg and fed mainly on grasses and herbs. They were thought to have numbered 50,000 historically, but by the early 1900s its numbers had fallen to fewer than 100. The exact cause of the Pyrenean Ibex’s extinction is unknown; scientists believe factors included poaching and the inability to compete with other mammals for food and habitat. The last Pyrenean Ibex was killed by a falling tree in northern Spain in 2000.