WRITE A REPORT ON EXTINCT SPECIES...
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According to scientists, more than one and one-half million species exist on the earth today. However, recent estimates state that at least 20 times that many species inhabit the planet.
Each day about 100 species become extinct. Scientists estimate that the total number of species lost each year may reach 40,000 by the year 2000. This is a rate far exceeding any in the last 65 million years.
There are more than 3,500 protected areas in existence worldwide. These areas include parks, wildlife refuges and other reserves. They cover a total of nearly 2 million square miles (5 million square km), or 3% of our total land area. Today, the United States is the home of over 200 endangered animal species. There are more than 1,000 animal species
endangered worldwide.
Aquatic species, which are often overlooked, are facing serious trouble. One third of the United States’ fish species, two-thirds of its crayfish species, and almost three-quarters of its mussel species are in trouble.
Endangered Species Terms :
VULNERABLE - A species particularly at risk because of low or declining
numbers or small range, but not a threatened species.
THREATENED SPECIE – a species whose population is not yet low enough
to be in immediate danger of extinction, but who certainly faces serious problems. If the problems affecting these species aren’t resolved, it is probable that the species will become endangered. The eastern indigo snake and the red kangaroo are examples of threatened species.
ENDANGERED SPECIE – a specie, plant or animal, that is in immediate
danger of becoming extinct. Its numbers are usually low, and it needs protection in order to survive. The Siberian tiger, the southern sea otter, the snow leopard, the green pitcher plant, and thousands of other plants and animals are endangered worldwide.
EXTINCT SPECIE – an extinct species is one that is no longer living. The
passenger pigeon, the dodo, and the Stegosaurus are examples of extinct species. These animals no longer exist on the earth.
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the fossil record) after a period of apparent absence.

The Tasmanian Tiger (Thylacinus cynocephalus) is an example of an extinct species.
Conservation status
by IUCN Red List category
Extinct
Extinct (EX)Extinct in the Wild (EW)
(list)(list)
Threatened
Critically Endangered (CR)Endangered (EN)Vulnerable (VU)
(list)(list)(list)
Lower Risk
Near Threatened (NT)Conservation Dependent (CD)Least Concern (LC)
(list)(list)
Other categories
Data Deficient (DD)Not Evaluated (NE)
(list)
Related topics
International Union for the
Conservation of Nature (IUCN)
IUCN Red ListNatureServe statusLists of organisms by population

Comparison of Red list classes above
and NatureServe status below

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More than 99% of all species that ever lived on Earth, amounting to over five billion species,[1] are estimated to have died out.[2][3][4][5] It is estimated that there are currently around 8.7 million species of eukaryote globally,[6] and possibly many times more if microorganisms, like bacteria, are included.[7] Notable extinct animal species include non-avian dinosaurs, saber-toothed cats, dodos, mammoths, ground sloths, thylacines, trilobites and golden toads.
Through evolution, species arise through the process of speciation—where new varieties of organisms arise and thrive when they are able to find and exploit an ecological niche—and species become extinct when they are no longer able to survive in changing conditions or against superior competition. The relationship between animals and their ecological niches has been firmly established.[8] A typical species becomes extinct within 10 million years of its first appearance,[5] although some species, called living fossils, survive with little to no morphological change for hundreds of millions of years.
Mass extinctions are relatively rare events; however, isolated extinctions are quite common. Only recently have extinctions been recorded and scientists have become alarmed at the current high rate of extinctions.[9][10][11][12] Most species that become extinct are never scientifically documented. Some scientists estimate that up to half of presently existing plant and animal species may become extinct by 2100.[13] A 2018 report indicated that the phylogenetic diversity of 300 mammalian species erased during the human era since the Late Pleistocene would require 5 to 7 million years to recover.[14]
According to the 2019 Global Assessment Report on Biodiversity and Ecosystem Services by IPBES, the biomass of wild mammals has fallen by 82%, natural ecosystems have lost about half their area and a million species are at risk of extinction—all largely as a result of human actions. Twenty-five percent of plant and animal species are threatened with extinction.[15][16][17]
In June 2019, one million species of plants and animals were at risk of extinction. At least 571 species have been lost since 1750, but likely many more. The main cause of the extinctions is the destruction of natural habitats by human activities, such as cutting down forests and converting land into fields for farming.[18]
A dagger symbol (†) placed next to the name of a species or other taxon normally indicates its status as extinct.
Explanation:
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