West Texas is a vernacular term applied to a region in the southwestern quadrant of the United States that primarily encompasses the arid and semiarid lands in the western portion of the state of Texas.
There is a general lack of consensus regarding the boundaries that separate East and West Texas. Walter Prescott Webb, the American historian and geographer, suggested the 98th meridian separates East and West Texas. The Texas writer A.C. Greene proposed that West Texas extends west of the Brazos River. Perhaps, the truth is no distinct line separates them. Rather, some places are clearly in West Texas and some are clearly in East Texas, and then some fall within a transitional zone between these two regions.
Central Texas is a region in the U.S. state of Texas surrounding Austin and roughly bordered by Brady to Kerrville to La Grange to Waco. Central Texas contains the Texas Hill Country and corresponds to a physiographic section designation within the Great Plains province, in a geographic context.
Central Texas includes the Austin–Round Rock, Killeen-Temple-Fort Hood, Bryan-College Station, and Waco metropolitan areas. The Austin–Round Rock and Killeen-Temple-Fort Hood areas are among the fastest-growing metropolitan areas in the state. Some of the largest cities in Central Texas are Austin, Round Rock, San Marcos and Waco.
Fauna of Asia is all the animals living in Asia and its surrounding seas and islands. Since there is no natural biogeographic boundary in the west between Europe and Asia, the term "fauna of Asia" is somewhat elusive. Asia is the eastern part of the Palearctic ecozone (which in turn is part of the Holarctic), and its South-Eastern part belongs to the Indomalaya ecozone (previously called the Oriental region). Asia shows a notable diversity of habitats, with significant variations in rainfall, altitude, topography, temperature and geological history, which is reflected in its richness of animal life.
The formation of the Asian fauna began in the Mesozoic with the splitting of Laurasian supercontinent. Asia blends elements from the both ancient supercontinents of Laurasia and Gondwana. Gondwanian elements were introduced from Africa and by India, which detached from Gondwana approximately 90 MYA, carrying its Gondwana-derived flora and fauna northward. Glaciation during the most recent ice age and the immigration of man affected the distribution of Asian fauna (see also Sahara pump theory). Eurasia and North America were many times connected by the Bering land bridge, and have very similar mammal and bird faunas, with many Eurasian species having moved into North America, and fewer North American species having moved into Eurasia (many zoologists consider the Palearctic and Nearctic to be a single Holarctic ecozone). See also List of extinct animals of Asia.
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The brown bear (Ursus arctos) is a large bear distributed across much of northern Eurasia and North America. Adult bears generally weigh between 100 and 635 kg (220 and 1,400 lb). Its largest subspecies, the Kodiak bear, rivals the polar bear as the largest member of the bear family and as the largest land-based predator. There are several recognized subspecies within the brown bear species. In North America, two types of the subspecies Ursus arctos horribilis are generally recognized—the coastal brown bear and the inland grizzly bear; these two types broadly define the range of sizes of all brown bear subspecies. An adult grizzly living inland in Yukon may weigh as little as 80 kg (180 lb), while an adult coastal brown bear in nearby coastal Alaska living on a steady, nutritious diet of spawning salmon may weigh as much as 680 kg (1,500 lb). The exact number of overall brown subspecies remains in debate.
The grizzly bear (Ursus arctos ssp.), is any North American subspecies of the brown bear, such as the mainland grizzly (U. a. horribilis), the Kodiak (U. a. middendorffi), the peninsular grizzly (U. a. gyas) and the recently extinct California grizzly (U. a. californicus). Specialists sometimes call the grizzly the North American brown bear because the grizzly and the brown bear are one species on two continents. In some places, some may nickname the grizzly the silvertip for the silvery, grizzly sheen in its fur.
Since the mainland grizzly is so widespread, it is representative and archetypal for the whole subspecific group. Even so, classification is being revised along genetic lines. Its closest relatives are the European cave bear and the polar bear.
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