FREE ESSAY ON ENDANGERED SPECIES

ENDANGERED SPECIES

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 donOt 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 and towns,
lumbering, mining, building dams, and draining wetlands all alter the environments so
extensively that ecosystems may be completely destroyed. With a burgeoning human
population requiring food, shelter, and clothing and constantly demanding more
energy-using devices, the temperation to exploit land for human use without regard for
consequences is great. 
Frequently, several forms of environmental change are responsible for the disappearance
of species. For example, as tropical forests are cut down, primates have progressively
smaller feeding and living spaces. They also become more accessible to hunters, who kill
monkeys for food and trap many primates for sale as pets, research animals, and zoo
specimens. Some animal species may move into human communities when their own are
destroyed. Extermination of marauding monkeys, roaming tigers, or foraging deer is easy
to justify by people whose livelihood is threatened. 
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 populations. Actually, whales supply only 1% of the
protein needs of any countries, such as Japan, that is actively engaged in whaling. In
the soviet Union, whaling meat is used to feed animals that are raised for their pelts,
such as sable and mink. Thus, the wearer of a ranch-raised Russian sable coat may have
indirectly contributed to the ultimate disappearance of the great whales. 
Many species have been hunted to the point of extinction for their fur, hides or
feathers. These include the big cats, alligators, kimonos, quetzel birds, eastern gray
kangaroos, egrets, and bids of paradise. 
Many people and groups have taken measure to stop the killing of endangered species.
Whether the species were killed deliberately, or if by accident (in a oil pill) these
groups are trying to stop the killing. 
In conclusion I just want every one to know that endagered species can be as big as a
blue whale or as small as a tiny little ant. 
Bibliography
?Endagered Species,O Grolier Encyclopedia, VII (1993),1-6. 
Gore, Rick. ?The March Toward Extinctotion.O National
Geographic,CLXXV (June, 1993),
662-698. 
Smith, Robert J. Endagered Species. Ed. by Derek Clien. 
New York,New York; Scholastic Inc., 1998 pp.1-87