Threatened? Endangered? Extinct?

Specie at risk of extinction is endangered. An animal is classified as endangered by The International Union for Conservation of Nature’s Red List of Threatened Species when its numbers in the wild have dropped so low that it’s at “extremely high risk” of extinction. It is illegal under the Endangered Species Act to capture, hunt, shoot, or otherwise harm an animal that’s listed as endangered.
Species are grouped into three levels of concern: threatened, endangered and extinct. Endangered Species Act 1973 bought these grouping criteria.
Threatened
When a species is threatened, it is a warning that its survival at risk. Basically, scientists look at the number of species members in a particular area habitat and compare them over time. And they also study what a species needs to survive like what kind of foods do they eat? How much space they require? What kinds of plants, animals, landscape features and climate are in their habitat? Scientists compare these things over time too. If anything has change radically the number of species members is quiet less than it used to be, a food source is not as much as required, and water sources might not be there, migration paths may be blocked, and so on. Scientists know that a species may already be trying hard to survive or might do the same in the future.
Endangered
If several members of one species are lost and their numbers get rapidly low, or if conditions make it hard for survival of a species, they considered as endangered. Animal populations that reduce even in one region or country can be listed as endangered for just that area. Animals or plants that are considered to be endangered have the possibility of becoming extinct and require sudden attention and conservation.
As of May 2017, the U.S. Fish and Wildlife Service lists 2,392 plants and animals as threatened or endangered around the world. This includes 1,652 species in the United States of America.
Extinct
Once a plant or an animal extinct, there is no chance to alter this. An extinct species is gone forever. Since the 1600s, more than 700 species of known plants and animals have gone extinct. It is estimated that between 30 and 1,400 species vanishes in a month. In one day alone, we can forget to at least one plant or animal species. How does extinction happen? Species disappear because of changes to the Earth that is caused either by nature or by human actions sometimes a natural event, like a volcano erupting, can kill an entire species.
Conservation successes
Recently animal’s number has increased through conservation; out of them one is is the bald eagle. Earlier there were about 500 bald eagles in the continental United States because of pesticides which damaged the shells of their eggs. Conservation efforts including captive breeding programs, habitat protection, and a ban on the insecticide DDT helped the bald eagle to regain their population again.

By: Saksham Gupta
Content: http://idahoptv.org/sciencetrek/topics/endangered_species/facts.cfm