Endangered Species Essay

617 Words 3 Pages
Endangered Species

Endangered species are living things whose population is so reduced that they are threatened with extinction. Thousands of species are included in this category. The International Union for the Conservation of nature and Natural Resources publishes a list of threatened mammals, birds, reptiles, amphibians, and (many people donÕt consider them) plants.

CAUSES OF EXTINCTION

Millions of years before humans, extinction of living things was linked to geological and climate, the effects of which were translated into major alternation of the environment. Environmental change is still the primary cause of the extinction of animals, but now the changes are greatly accelerated by humans activity. Clearing land for farms
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Pollution is another form of environments change. Forty species of birds in the United States, including peregrine hawk, bald eagle, pelicans, and roseate terns, lay thin-shelled as a result of ingesting degradation products of and some other chlorination hydrocarbon insecticides that make their way into the food chain. Species of salamanders in New England are dying out because the ponds in which they breed and the moist soil in which they must live are watered by acid rain (water that combines with pollutants in the air to form acid, sulfuric acid, and other corrosive compounds. Industrial waste dumped in the Mediterranean have so depleted the oxygen supply that some species of bacteria that decompose sewage have been wiped out and the nutrient cycles disturbed.
Even the ocean environment has been altered by dumping.

Many species have been exterminated or endangered as a result of humans killing the individuals for food. The Hawaiian state bird, the none (a type of goose), is almost as easy to catch a the legendary do do and nearly met the same fate. The 22 finds of clams and 30 kinds of fish imperiled in the United States are probably all endangered by varying combinations of naturally changing environments, pollution, and over-harvesting. Whale species are on the endangered list. Whaling is often justified as supplying a source of protein for protein-poor

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