The Abbasid Caliphate

The Abbasid Caliphate The Abbasid Caliphate, which ruled most of the Muslim world from Baghdad in what is now Iraq, lasted from 750 to 1258 A.D. It was the third Islamic caliphate and overthrew the Umayyad Caliphate to take power in all but the western-most fringe of Muslim holdings at that time- Spain and Portugal, known then as the al-Andalus region. After they defeated the Ummayads, with significant Persian assistance, the Abbasids decided to de-emphasize ethnic Arabs and recreate the Muslim caliphate as a multi-ethnic entity. As part of that reorganization, in 762 they moved the capital from Damascus, in what is now Syria, northeast to Baghdad, not far from Persia in present-day Iran. Early Period of the New Caliphate Early in the Abbasid period, Islam exploded across Central Asia, although usually the elites converted and their religion trickled down gradually to ordinary people. This, however, was not conversion by the sword. Incredibly, just one year after the fall of the Umayyads, an Abbasid army was fighting against the Tang Chinese in what is now Kyrgyzstan, in the  Battle of Talas River  in 759. Although Talas River seemed like just a small skirmish, it had important consequences- it helped to set the boundary between the Buddhist and Muslim spheres in Asia and also allowed the Arab world to learn the secret of paper-making from captured Chinese artisans. The Abbasid period is considered a Golden Age for Islam. Abbasid caliphs sponsored great artists and scientists and great medical, astronomical, and other scientific texts from the classical period in Greece and Rome were translated into Arabic, saving them from being lost. While Europe languished in what was once called its Dark Ages, thinkers in the Muslim world expanded upon the theories of Euclid and Ptolemy. They invented algebra, named stars like Altair and Aldebaran and even used hypodermic needles to remove cataracts from human eyes. This was also the world that produced the stories of the Arabian Nights- the tales of Ali Baba, Sinbad the Sailor, and Aladdin came from the Abbasid era. The Fall of the Abbasid The Golden Age of the Abbasid Caliphate ended on February 10, 1258, when Genghis Khans grandson, Hulagu Khan, sacked Baghdad. The Mongols burned the great library in the Abbasid capital and killed the Caliph Al-Mustasim. Between 1261 and 1517, surviving Abbasid caliphs lived under Mamluk rule in Egypt, wielding more or less control over religious matters while having little to no political power. The last Abbasid caliph, Al-Mutawakkil III, supposedly handed over the title to the Ottoman Sultan Selim The First in 1517. Still, what was left of the destroyed libraries and scientific buildings of the capital lived on in Islamic culture- as did the pursuit of knowledge and understanding, especially concerning medicine and science. And although the Abbasid Caliphate was considered Islams greatest in history, it would certainly not be the last time a similar rule took over the Middle East.

Koala Facts

Koala Facts Koalas are marsupials that are native to the Australian continent. Their scientific name, Phascolarctos cinereus, is derived from several Greek words meaning pouch bear (phaskolos arktos) and having an ashen appearance (cinereus). They are often called koala bears, but that is scientifically incorrect, since they are not bears. Their most distinctive characteristics are their fluffy ears and their spoon shaped noses. Koalas are most often found in the southern and eastern areas of the continent. Fast Facts: Koala Scientific Name: Phascolarctos cinereusCommon Names: Koala bearOrder: DiprotodontiaBasic Animal Group: MammalsDistinguishing Characteristics: Spoon shaped noses and fluffy earsAverage Size: 2 - 3 feet in heightAverage Weight: 20 - 25 poundsLife Span: 12 - 18 yearsDiet: HerbivoreHabitat: Forests and woodlands in AustraliaPopulation: Approximately 100,000 - 500,000Conservation Status: VulnerableFun Fact: Koala babies, called joeys, are blind at birth. Description Koalas are best known for their round body appearance and their distinctive ears and nose. Like other marsupials, females have a permanent pouch for raising young. Koala pouches are positioned in the lower portion of a koalas body. The pouches open outward so a joey (baby) can climb into it from the birth canal. When a joey is present, its mother uses her sphincter muscles to make sure that the pouch is closed so that her baby wont fall out. Koalas are uniquely suited for living their life in trees. Their paws help them to expertly grip and climb trees. The pads on their paws are very rough and help with their gripping ability. Each paw has five digits. The front paws have two digits that are opposed to the remaining three digits. This helps with their grip strength while climbing. Their fur, which is typically light gray or brown, is very thick and helps to protect them from both low and high temperature conditions. konmesa / Getty Images Koalas are usually between 2 to 3 feet in height and can weigh up to approximately 25 pounds. Other physical characteristics of koalas are their lack of a tail and their long limbs for their body size. Their tail is considered a vestigial structure and is thought to have been lost due to evolutionary adaptation. They also have one of the smallest brain-to-body-weight ratio of any mammal and are not considered to be very intelligent creatures. Habitat and Distribution Koalas live in Australia in a variety of habitats from forests to woodlands. Their preferred habitats are forests composed of eucalyptus trees, where they are able to survive very high up in the trees. They are found in New South Wales, Queensland, Victoria, and South Australia. Diet and Behavior This is an image of a koala eating eucalyptus in Queensland, Australia.   georgeclerk/E/Getty Images The koalas diet consists mainly of eucalyptus leaves. They can eat a pound to two pounds of leaves a day and have developed specialized structures to aid in the digestion of so much foliage. Their intestines (caecum) can be 7 to 8 feet in length. Although eucalyptus can be poisonous to most animals, symbiotic bacteria are present in their intestinal pouch which break down the toxic substances like tannins found in eucalyptus leaves. Generally speaking, koalas are solitary animals. Each koala has a home range of a number of eucalyptus trees in a given area. The size of this range can vary depending on the koalas status, sex, and habitat quality. A dominant male for example, may have a comparatively larger area. Ranges for different koalas overlap, which allows koalas to have social interaction with others in their vicinity. Koalas are mostly nocturnal. They are not very active animals and spend a large portion of their time sitting or sleeping to conserve energy. Eucalyptus leaves are difficult to digest and require a considerable amount of energy expenditure. Koalas can sleep for up to 17 to 20 hours a day. Reproduction and Offspring A koala joey remains in its mothers pouch for the first months of its life.   Bruce Lichtenberger/Photolibrary/Getty Images Plus Koalas typically breed from August to February. Male koalas attract the females through their loud vocal bellows. Females usually have one baby koala per year, producing some six or so offspring over the course of their lifetime, since females dont always breed each year. After becoming impregnated, a koala will give birth after a gestation period of a little longer than a month (about 35 days). The baby is called a joey and is usually very small. The baby may weigh under .0025 pounds and be under an inch long, about the size of an almond. The joey is blind at birth and doesnt have any hair. It travels from the birth canal to its mothers pouch, where it will remain for approximately the first six to seven months of its life. Even after developing to the point that it is no longer in its mothers pouch, the joey will often remain with its mother until its next brother or sister appears outside the mothers pouch the following year. Threats Koalas are mainly threatened by habitat loss. Human encroachment on their habitat from land clearing has a large impact on their survival. They can also be impacted by bush-fires and disease. Koalas are susceptible to the bacteria that cause chlamydia. This disease can lead to the development of conjunctivitis, an eye infection that may result in blindness. Chlamydia may also result in pneumonia and infections of the urinary tract and reproductive systems. Incidences of complications from chlamydia increase in koala populations that experience high environmental stress. Conservation Status Koalas are designated as vulnerable by the International Union for Conservation of Nature (IUCN). According to the IUCN, approximately 100,000 to 500,000 animals are left in the wild. While koalas themselves have some protection under the law, their population continues to decrease mainly due to loss of habitat. The Koala Protection Act is proposed legislation in Australia to help protect the koalas habitat. The Australian Koala Foundation believes that there are less than 100,000 left in the wild, and even as few as 43,000. Species There is one species of koala, but scientists disagree whether or not there are sub-species. The most common three sub-species of koalas are considered to be: Phascolarctos cinereus adustus (Northern/Queensland), Phascolarctos cinereus cinereus (New South Wales) and Phascolarctos cinereus victor (Victorian). These sub-species are classified based on slightly different physical characteristics like physical size and fur properties. Based on these characteristics, some scientists believe that there are three sub-species, others two, and others none. Koalas and Humans This girl is feeding a koala.   Peter Phipp/Photographers Choice/Getty Images Plus Humans and koalas have a long and varied history. Beginning in the early 1900s over a million were killed for their fur. The population of koalas was in danger of being wiped out before the practice stopped. Koalas can be very aggressive when disturbed or surprised by humans in their natural habitats. They defend themselves with their sharp teeth and pointed claws which are similar to talons. These structures are capable of shredding skin and can inflict considerable damage. Sources Koala. National Geographic, 21 Sept. 2018, www.nationalgeographic.com/animals/mammals/k/koala/.  Koala. San Diego Zoo Global Animals and Plants, animals.sandiegozoo.org/animals/koala.Physical Characteristics of the Koala. Australian Koala Foundation, www.savethekoala.com/about-koalas/physical-characteristics-koala.  The Life of a Koala . Australian Koala Foundation, www.savethekoala.com/about-koalas/life-koala.