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Domestic Pigeons
The domestic pigeon (''Columba livia domestica'' or ''Columba livia'' ''forma'' ''domestica'') is a pigeon subspecies that was derived from the rock dove (also called the rock pigeon). The rock pigeon is the world's oldest domesticated bird. Mesopotamian cuneiform tablets mention the domestication of pigeons more than 5,000 years ago, as do Egyptian hieroglyphics. Research suggests that domestication of pigeons occurred as early as 10,000 years ago. Pigeons have made contributions of considerable importance to humanity, especially in times of war. In war the homing ability of pigeons has been put to use by making them messengers. So-called war pigeons have carried many vital messages and some have been decorated for their services. Medals such as the Croix de Guerre, awarded to Cher Ami, and the Dickin Medal awarded to the pigeons G.I. Joe and Paddy, amongst 32 others, have been awarded to pigeons for their services in saving human lives. Despite this, city pigeons today are s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Friedrich Gmelin
, fields = , workplaces = University of GöttingenUniversity of Tübingen , alma_mater = University of Tübingen , doctoral_advisor = Philipp Friedrich GmelinFerdinand Christoph Oetinger , academic_advisors = , doctoral_students = Georg Friedrich HildebrandtFriedrich StromeyerCarl Friedrich KielmeyerWilhelm August LampadiusVasily Severgin , notable_students = , known_for = Textbooks on chemistry, pharmaceutical science, mineralogy, and botany , author_abbrev_bot = J.F.Gmel. , author_abbrev_zoo = Gmelin , influences = Carl Linnaeus , influenced = , relatives = Leopold Gmelin (son) , awards = Johann Friedrich Gmelin (8 August 1748 – 1 November 1804) was a German naturalist, botanist, entomologist, herpetologist, and malacologist. Education Johann Friedrich Gmelin was born as the eldest son of Philipp Friedrich Gmelin in 1748 in Tübingen. He studied medicine under his father at University of Tübingen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Companion Animal
A pet, or companion animal, is an animal kept primarily for a person's company or entertainment rather than as a working animal, livestock, or a laboratory animal. Popular pets are often considered to have attractive appearances, intelligence, and relatable personalities, but some pets may be taken in on an altruistic basis (such as a stray animal) and accepted by the owner regardless of these characteristics. Two of the most popular pets are dogs and cats. Other animals commonly kept include rabbits; ferrets; pigs; rodents such as gerbils, hamsters, chinchillas, rats, mice, and guinea pigs; birds such as parrots, passerines, and fowls; reptiles such as turtles, lizards, snakes, and iguanas; aquatic pets such as fish, freshwater snails, and saltwater snails; amphibians such as frogs and salamanders; and arthropod pets such as tarantulas and hermit crabs. Small pets may be grouped together as pocket pets, while the equine and bovine group include the largest companion a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pigeon Fancy
Pigeon keeping or pigeon fancying is the art and science of breeding domestic pigeons. People have practiced pigeon keeping for at least 5,000 years and in almost every part of the world. In that time, humans have substantially altered the morphology and the behaviour of the domesticated descendants of the rock dove to suit their needs for food, aesthetic satisfaction and entertainment. People who breed pigeons are commonly referred to as pigeon fanciers.Wendell (1977) 1 The hobby is gaining in popularity in the United States, after having waned within the last 50 years. Both the hobby and commercial aspects of keeping pigeons are thriving in other parts of the world. Types of pigeons kept The rock dove, the wild ancestor of domestic pigeons, was domesticated at least five thousand years ago, when it is first mentioned in historical records from Mesopotamia. There are hundreds of breeds of domesticated pigeons arising from this common ancestor which are currently cultivated by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fancy Pigeon
Fancy pigeon refers to any breed of domestic pigeon, which is a domesticated form of the wild rock dove (''Columba livia''). They are bred by pigeon fanciers for various traits relating to size, shape, color, and behavior, and often exhibited at pigeon shows, fairs and other livestock exhibits. There are about 800 pigeon breeds; considering all regional varieties all over the world there may be 1100 breeds. The European list of fancy pigeons alone names about 500 breeds. No other domestic animal has branched out into such a variety of forms and colours. Charles Darwin is known to have crossbred fancy pigeons, particularly the Ice Pigeon, to study variation within species, this work coming three years before his groundbreaking publication, ''On the Origin of Species''. Pigeon showing Pigeon fanciers from many different countries exhibit their birds at local, inter-state or national shows and compete against one another for prizes. One typical country show in Australia in 2008 h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
European Colonization Of The Americas
During the Age of Discovery, a large scale European colonization of the Americas took place between about 1492 and 1800. Although the Norse had explored and colonized areas of the North Atlantic, colonizing Greenland and creating a short term settlement near the northern tip of Newfoundland circa 1000 CE, the later and more well-known wave by the European powers is what formally constitutes as beginning of colonization, involving the continents of North America and South America. During this time, several empires from Europe—primarily Britain, France, Spain, Portugal, Russia, the Netherlands and Sweden—began to explore and claim the land, natural resources and human capital of the Americas, resulting in the displacement, disestablishment, enslavement, and in many cases, genocide of the indigenous peoples, and the establishment of several settler colonial states. Some formerly European settler colonies—including New Mexico, Alaska, the Prairies or northern Grea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Akbar
Abu'l-Fath Jalal-ud-din Muhammad Akbar (25 October 1542 – 27 October 1605), popularly known as Akbar the Great ( fa, ), and also as Akbar I (), was the third Mughal emperor, who reigned from 1556 to 1605. Akbar succeeded his father, Humayun, under a regent, Bairam Khan, who helped the young emperor expand and consolidate Mughal domains in India. A strong personality and a successful general, Akbar gradually enlarged the Mughal Empire to include much of the Indian subcontinent. His power and influence, however, extended over the entire subcontinent because of Mughal military, political, cultural, and economic dominance. To unify the vast Mughal state, Akbar established a centralised system of administration throughout his empire and adopted a policy of conciliating conquered rulers through marriage and diplomacy. To preserve peace and order in a religiously and culturally diverse empire, he adopted policies that won him the support of his non-Muslim subjects. Eschewing t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Speckled Pigeon
The speckled pigeon (''Columba guinea''), or (African) rock pigeon, is a pigeon that is a resident breeding bird in much of Africa south of the Sahara. It is a common and widespread species in open habitats over much of its range, although there are sizable gaps in its distribution. It is sometimes referred to as the Guinea pigeon due to its similar coloring to some species of guineafowl. Taxonomy In 1747 the English naturalist George Edwards included a description and an illustration of the speckled pigeon in the second volume of his ''A Natural History of Uncommon Birds''. His hand-coloured etching was made from two live birds at the home of the Duke of Richmond in London. Edwards was told that the pigeons had been brought from the inland region of Guinea in West Africa. When in 1758 the Swedish naturalist Carl Linnaeus updated his ''Systema Naturae'' for the tenth edition, he placed the speckled pigeon with all the other pigeons in the genus ''Columba''. Linnaeus included a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crossbreed
A crossbreed is an organism with purebred parents of two different breeds, varieties, or populations. ''Crossbreeding'', sometimes called "designer crossbreeding", is the process of breeding such an organism, While crossbreeding is used to maintain health and viability of organisms, irresponsible crossbreeding can also produce organisms of inferior quality or dilute a purebred gene pool to the point of extinction of a given breed of organism. A domestic animal of unknown ancestry, where the breed status of only one parent or grandparent is known, may also be called a crossbreed though the term "mixed breed" is technically more accurate. Outcrossing is a type of crossbreeding used within a purebred breed to increase the genetic diversity within the breed, particularly when there is a need to avoid inbreeding. In animal breeding, ''crossbreeds'' are crosses within a single species, while '' hybrids'' are crosses between different species. In plant breeding terminology, the term ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Introgression
Introgression, also known as introgressive hybridization, in genetics is the transfer of genetic material from one species into the gene pool of another by the repeated backcrossing of an interspecific hybrid with one of its parent species. Introgression is a long-term process, even when artificial; it may take many hybrid generations before significant backcrossing occurs. This process is distinct from most forms of gene flow in that it occurs between two populations of different species, rather than two populations of the same species. Introgression also differs from simple hybridization. Simple hybridization results in a relatively even mixture; gene and allele frequencies in the first generation will be a uniform mix of two parental species, such as that observed in mules. Introgression, on the other hand, results in a complex, highly variable mixture of genes, and may only involve a minimal percentage of the donor genome. Definition Introgression or introgressive hybri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossil Record
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the absolu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dovecote
A dovecote or dovecot , doocot ( Scots) or columbarium is a structure intended to house pigeons or doves. Dovecotes may be free-standing structures in a variety of shapes, or built into the end of a house or barn. They generally contain pigeonholes for the birds to nest. Pigeons and doves were an important food source historically in the Middle East and Europe and were kept for their eggs and dung. History and geography The oldest dovecotes are thought to have been the fortress-like dovecotes of Upper Egypt, and the domed dovecotes of Iran. In these regions, the droppings were used by farmers for fertilizing. Pigeon droppings were also used for leather tanning and making gunpowder. In some cultures, particularly Medieval Europe, the possession of a dovecote was a symbol of status and power and was consequently regulated by law. Only nobles had this special privilege, known as ''droit de colombier''. Many ancient manors in France and the United Kingdom have a dovecote st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cappadocia
Cappadocia or Capadocia (; tr, Kapadokya), is a historical region in Central Anatolia, Turkey. It largely is in the provinces Nevşehir, Kayseri, Aksaray, Kırşehir, Sivas and Niğde. According to Herodotus, in the time of the Ionian Revolt (499 BC), the Cappadocians were reported as occupying a region from Mount Taurus to the vicinity of the Euxine (Black Sea). Cappadocia, in this sense, was bounded in the south by the chain of the Taurus Mountains that separate it from Cilicia, to the east by the upper Euphrates, to the north by Pontus, and to the west by Lycaonia and eastern Galatia. Van Dam, R. ''Kingdom of Snow: Roman rule and Greek culture in Cappadocia.'' Philadelphia: University of Pennsylvania Press, 2002, p.13 The name, traditionally used in Christian sources throughout history, continues in use as an international Tourism in Turkey, tourism concept to define a region of exceptional natural wonders, in particular characterized by fairy chimneys and a unique ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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