How Many Animals Have To Be Left To Be Considered Endangered

What Are Endangered and Threatened Species?

A century agone, a bird chosen the passenger dove lived in Due north America. There were and then many rider pigeons that people often saw great flocks of them flying overhead containing thousands, fifty-fifty millions, of birds. Today, there is not a single ane left. What happened?

The passenger pigeon became extinct. All living passenger pigeons disappeared from the earth entirely. The passenger pigeon became extinct for two reasons. First, the forests where information technology lived were cut downwards to make way for farms and cities. Second, many pigeons were shot for sport and because they were adept to swallow. At that time, there were no hunting laws to protect endangered species similar there are now.

At that place are over 1,300 endangered or threatened species in the United States today. Endangered species are those plants and animals that have become then rare they are in danger of becoming extinct. Threatened species are plants and animals that are probable to become endangered within the foreseeable future throughout all or a significant portion of its range.

How Does Extinction Happen?

Species disappear because of changes to the globe that are acquired either by nature or past the actions of people. Sometimes a natural consequence, similar a volcano erupting, can kill an unabridged species. Other times, extinction will happen slowly every bit nature changes our world. For instance, after the Water ice Ages, when the glaciers melted and the earth became warmer, many species died because they could not live in a warmer climate. Newer species that could survive in a warmer environment took their places.

People can also cause the extinction of plants and animals. The principal reason that many species are endangered or threatened today is considering people have

changed the homes or habitats upon which these species depend. A habitat includes not only the other plants and animals in an surface area, but all of the things needed for the species' survival -- from sunlight and wind to food and shelter. The United States has many habitats, from ocean beaches to mountain tops. Every species requires a sure habitat in order to alive. A cactus, for example, needs the sunny, dry out desert in order to grow. A polar bear, on the other hand, would not live in a desert, because it could not discover enough food and water.

Pollution can also bear on wild fauna and contribute to extinction. The Nashville crayfish is endangered mainly because the creek where it lives has been polluted by people.

Pesticides and other chemicals can poisonous substance plants and animals if they are not used correctly. The bald eagle is one bird that was harmed past pesticides. In the past, a pesticide called DDT was used past many farmers. Rains washed the pesticide into the lakes and streams where it poisoned fish. Later eating the poisoned fish, the eagles would lay eggs with very thin shells. These eggs were usually crushed earlier they could hatch. Today, people are not allowed to employ Ddt, and this has contributed to the bald eagle being removed from the endangered and threatened species lists needed for the species' survival -- from sunlight and current of air to food and shelter.

The United states of america has many habitats, from ocean beaches to mountain tops. Every species requires a sure habitat in social club to alive. A cactus, for example, needs the sunny, dry desert in order to grow. A polar bear, on the other hand, would not alive in a desert, because it could not detect plenty nutrient and h2o.

People can also endanger plants and animals past moving, or introducing, new species into areas where they do not naturally live. Some of these species do and so well in their new habitat that they endanger those species already living at that place, called the native species. These introduced species are called invasive species. For example, when some fish are introduced into a lake or stream, they may prey upon, or consume the nutrient of the native fish. The native species may then have to observe a new source of nutrient or a new home, or face up becoming endangered or extinct.

Another way that people impairment animals and plants is by taking them from the wild. Some people might catch an insect like the Mission bluish butterfly for a butterfly collection. Others might capture a wild brute for a pet, or pick a bloom considering it's pretty. In addition, some people illegally hunt animals for food, skins, or fur. In the past, lots of American crocodiles were killed so that their skins could be fabricated into shoes and other clothing. This crocodile is now an endangered species.

Why Protect Endangered and Threatened Species?

Tin can you imagine walking in the forest without hearing birds singing, or picture what a field would be like without wildflowers blooming? Our plants and wildlife

make the world a more interesting and beautiful place. More chiefly, all living species, including people, depend on other species for survival. For example, if a fish such as the shortnose sturgeon becomes extinct, all of the species that rely on it will also suffer and may get threatened or endangered.

We all depend upon plants and wildlife. From studying them, we take learned new means of growing food, making clothing, and building houses. Scientists take discovered how to utilise certain plants and animals every bit medicine. If we neglect to protect threatened or endangered species, nosotros will never know how they might accept improved our lives.

Endangered and threatened species need our help. Government agencies, such equally the U.Due south. Environmental Protection Agency, the U.South. Section of

Agronomics, the U.S. Fish and Wild fauna Service, NOAA's National Marine Fisheries Service, and the National Park Service, along with state fish and wildlife agencies and private groups are making information available and then people can better protect endangered and threatened species and their habitats. You tin can contact these agencies for information and join the claiming in helping to protect endangered and threatened species, and all wild fauna, from extinction.

Source: https://www.epa.gov/endangered-species/learn-more-about-threatened-and-endangered-species

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