تقرير انجليزي عن Camels

[frame="4 80"] Camels are even-toed ungulates within the genus Camelus. The dromedary or Arabian camel has a single hump, and the Bactrian camel has two humps. They are native to the dry desert areas of western Asia, and central and east Asia, respectively. XXXX species are domesticated to provide milk and meat, and as beasts of burden.
The term camel is also used more broadly to describe any of the six camel like creatures in the family Camelidae: the two true camels, and the four South American camelids, the llama, alpaca, guanaco, and vicuña.
The average life expectancy of a camel is 40 to 50 years. A fully grown adult camel stands 1.85 m (6 ft 1 in) at the shoulder and 2.15 m (7 ft 1 in) at the hump. The hump rises about 30 inches (75 cm) out of its body. Camels can run at up to 65 km/h (40 mph) in short bursts and sustain speeds of up to 40 km/h (25 mph).
Fossil evidence indicates that the ancestors of modern camels evolved in North America during the Palaeogene period, and later spread to most parts of Asia. Humans first domesticated camels before 2000 BC.
Distribution and numbers
The almost 14 million dromedaries alive today are domesticated animals (mostly living in Somalia, the Sahel, Maghreb, Middle East and Indian subcontinent). An estimated quarter of the world's camel population is found in Somalia and in the Somali Region of Ethiopia, where the camel is an important part of nomadic Somali life. They provide the Somali people with milk, food and transportation.
The Bactrian camel is now reduced to an estimated 1.4 million animals, mostly domesticated. It is thought that there are about 1000 wild Bactrian camels in the Gobi Desert in China and Mongolia.
There is a substantial feral population of dromedaries estimated at up to 700,000 in central parts of Australia, descended from individuals introduced as transport animals in the 19th century and early 20th century. This population is growing at approximately 11% per year. The

government of South Australia has decided to cull the animals using aerial marksmen, because the camels use too much of the limited resources needed by sheep farmers.[citation needed] For more information, see Australian feral camel.
A small population of introduced camels, dromedaries and Bactrians survived in the Southwest United States until the 1900s. These animals, imported from Turkey, were part of the US Camel Corps experiment and used as draft animals in mines and escaped or were released after the project was terminated. A descendant of one of these was seen by a backpacker in Los Padres National Forest in 1972. Twenty-three Bactrian camels were brought to Canada during the Cariboo Gold Rush.

Eco-behavioural adaptations
Camels do not store water in their humps as is commonly believed. The humps are actually a reservoir of fatty tissue. Concentrating body fat in their humps minimizes heat-trapping insulation throughout the rest of their body, which may be an adaptation to living in hot climates.[5] When this tissue is XXXXbolized, it acts as a source of energy, and yields more than 1 g of water for each 1 g of fat converted through reaction with oxygen from air. This process of fat XXXXbolization generates a net loss of water through respiration for the oxygen required to convert the fat.
Camels are able to withstand changes in body temperature and water XXXXXXX that would kill most other animals. Their temperature ranges from 34 °C (93 °F) at night up to 41 °C (106 °F) during the day, and only above this threshold will they begin to sweat. The upper body temperature range is often not reached during the day in milder climatic conditions, and therefore, the camel may not sweat at all during the day. Evaporation of their sweat takes place at the skin level, not at the surface of their coat, thereby being very efficient at cooling the body compared to the amount of water lost through sweating. This ability to fluctuate body temperature and the efficiency of their sweating allows them to preserve about five litres of water a day
Military uses
Attempts have been made to employ camels as cavalry and dragoon mounts and as freight animals instead of horses and mules. In some places, such as Australia, some of the camels have become feral and are considered to be dangerous to travelers on camels. The camels were mostly used in combat because of their ability to scare off horses in close ranges, a quality famously employed by the Achaemenid Persians when fighting Lydia, although the Persians usually used camels as baggage trains for arrows and equipment. The horses detest the smell of camels, and therefore, the horses in the vicinity become harder to control. The United States Army had an active camel corps stationed in California in the 19th century, and the brick stables may still be seen at the Benicia Arsenal in Benicia, California, now converted to artists' and artisans' studio spaces. Camels have been used in wars throughout Africa, and also in the East Roman Empire as auxiliary forces known as Dromedarii recruited in desert provinces. During the American Civil War, camels were used at an experimental stage, but were not used any further, as they were unpopular with the men.

Dairy
Camel milk is a staple food of desert nomad tribes and is richer in fat and protein than cow milk. It is said to have many healthful properties. It is used as a medicinal product in India[citation needed] and as an aphrodisiac in Ethiopia. Bedouins believe that the curative powers of camel milk is enhanced if the camel's diet consists of certain plants. Camel milk can readily be made into yogurt, but can only be made into butter or cheese with difficulty. Butter or yogurt made from camel milk is said to have a very faint greenish tinge.
Meat
A camel carcass can provide a substantial amount of meat. The male dromedary carcass can weigh 400 kg (900 lb) or more, while the carcass of a male Bactrian can weigh up to 650 kg (1,400 lb). The carcass of a female camel (or she-camel) weighs less than the male, ranging between 250 and 350 kg (550–770 lb), but can provide a substantial amount of meat. The brisket, ribs and loin are among the preferred parts, but the hump is considered a delicacy and is most favored.[citation needed] It is reported that camel meat tastes like coarse beef, but older camels can prove to be tough and less flavorful.

References:
1. Camel - Wikipedia, the free encyclopedia
2. Welcome to the Official Camel Website
3. http://www.livingdesert.org/animals/arabian_camel.asp[/frame]