why do you think some animals become endangered

Today, many of us are aware that certain animals, such as
and, are endangered species. What many might not realize, though, is that the endangered species list contains thousands of species, and they're not all animals. Indeed, many of the species you'll find on the list are! is the complete disappearance of a species from Earth. are good examples of animals that are extinct and no longer roam Earth. Animals and plants that are at risk of becoming extinct because of threats from changing environments or are considered threatened or endangered. An "endangered" species is any species in danger of through all or a significant portion of its. A "threatened" species is any species that is likely to become an endangered species within the future. The International Union for Conservation of Nature (IUCN) keeps track of endangered species around the world. As of 2006, the IUCN estimates that up to 40 percent of all organisms are endangered. Thanks to concerned citizens and scientists worldwide, many nations have passed laws to protect and endangered species. Some laws forbid hunting, while others land development or create special preserves as endangered species habitats. Unfortunately, not all endangered species obtain protection via special conservation laws. In fact, conservationists believe only a very few of the many threatened species benefit from protective laws, while many more species face the of without the public taking notice. In the United States, researchers believe the number of species threatened with is 10 times greater than the number protected under the Endangered Species Act. Some believe that governments have made it too hard for a threatened species to be added to the official list of endangered species in order to receive special protection. Although any person can ask the government to list a species as threatened or endangered, the listing process can take more than two years to complete.


Scientists must establish the conservation of a species, which is an of the chance of a species not living. Researchers must take many factors into account, such as the number remaining, the decrease in population over time, breeding rates, environmental and predatory threats, to name a few. Despite these challenges, progress has been made. More than 195 countries around the world have signed an accord, agreeing to create action plans to protect endangered and other threatened species. In the United States, these plans are usually called "species recovery plans" and are developed according to guidelines in the Endangered Species Act. Experts with the Fish and Wildlife Service's Recovery Program design recovery plans to reverse the decline of threatened or endangered species. Overall, the Endangered Species Act has been widely recognized by wildlife scientists as an effective tool in the battle against. Supporters of the Endangered Species Act believe it has been very successful in slowing the decline of threatened and endangered species. For example, 19 species have been delisted and recovered, and 93 percent of listed species in the northeastern part of the country have a recovering or stable population. species are on the edge of extinction, but have you ever wondered why? Explore these major reasons why species become endangered and have to be added to the endangered species list. There are many historical accounts about how humans have over hunted and over harvested species, leading to their endangerment, and often, extinction. The Passenger Pigeon is a classic example of how humans over hunted a species, leading to the extinction of the entire species. Plant species can also be overharvested, leading to their endangerment. For example, the Goldenseal plant ( Hydrastis canadensis ) is a very popular medicinal plant in the United States that has now become threatened due to overharvesting in the wild.


Many species in our world today are becoming endangered due to a loss of their primary habitat. For species that are not able to adapt well to changing conditions, is particularly challenging to their survival. In general, highly specialized species that have very specific habitat requirements do not fare well when faced with a changing environment, such as a changing climate, or to a loss in habitat. While some species have become well adapted to human presence, such as the Norway Rat ( Rattus norvegicus ), some species are so specialized that changes in their environment may threaten their very survival. Pollution can harm species, sometimes even killing them. When enough members of a species are negatively impacted by pollution, that species may become threatened. For example, Falco peregrinus when DDT was widely used prior to becoming banned in the U. S. and Canada in 1971. When exotic species are introduced into a new environment, they are often able to thrive because they do not have any predators there. Because these introduced tend to do so well, they will often outcompete native species that exist within the same niche that they do, and they can become. One example of this is in the Great Lakes region of the United States, where the Zebra Mussel ( Dreissena polymorpha ) was accidently introduced, many of the native mussel species in the Great Lakes have now become threatened or endangered due to the presence of the highly competitive Zebra Mussel. As humans increase in population around the world and move into areas where wildlife live, there is an increase in human-wildlife conflict. Sadly, in many cases, wildlife are often killed when predators kill livestock or eat crops. For wildlife populations that have already been reduced due to loss of habitat and other issues, such conflicts can increase the chances that a species will become threatened or endangered.


In the United States, the native American Chestnut tree ( Castanea dentata ) was virtually wiped out due to a chestnut blight fungus that was introduced to the United States in 1904. Because the American Chestnut tree had evolved in conditions without the presence of the blight, it lacked the natural resistance to survive the blight. Currently, there is ongoing research with the aim of creating a hybrid chestnut variety that is a cross between the American Chestnut and a variety of Chinese chestnut that is resistant to the chestnut blight. Some species do not reproduce very often, and they may have few offspring each time that they breed. Other species may take a number of years to become sexually mature, thus reducing their opportunity to breed over their lifetime. In the face of other challenges to a speciesв survival such as overhunting or habitat loss, it may be difficult for the species to recover even once the threats have been removed. Some species, such as the Cheetah ( Acinonyx jubatus ), maintain low, which makes them less able to adapt when faced with challenges such as overhunting or habitat loss. This low genetic diversity also. Some species are found only in certain limited areas. If there are only a limited number of individuals of a species that are in existence to begin with, and the environment changes, there is a lower probability that such a species will survive in the future. Rare species can easily become extinct in the face of hunting. ( Panthera tigris balica ) is an example of a rare species that was over hunted to the point of extinction, as there were a very limited number of individuals to begin with. pmc-box. rand-33 span,. pmc-box. rand-33 p,. pmc-box. rand-33{color:#222! important}

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