Yüklenme Tarihi: 21 Nisan 2017 - 14:44
Bison vs grizzly bear. Buffalo vs grizzly bear. Bisons meeting grizzly bear - who will run away?
The American bison (Bison bison), also commonly known as the American buffalo or simply buffalo, is a North American species of bison that once roamed the grasslands of North America in massive herds. They became nearly extinct by a combination of commercial hunting and slaughter in the 19th century and introduction of bovine diseases from domestic cattle, and have made a recent resurgence largely restricted to a few national parks and reserves. Their historical range roughly comprised a triangle between the Great Bear Lake in Canada's far northwest, south to the Mexican states of Durango and Nuevo León, and east to the Atlantic Seaboard of the United States (nearly to the Atlantic tidewater in some areas) from New York to Georgia and per some sources down to Florida. Bison were seen in North Carolina near Buffalo Ford on the Catawba River as late as 1750.
Two subspecies or ecotypes have been described: the plains bison, smaller in size and with a more rounded hump, and the wood bison (B. b. athabascae)—the larger of the two and having a taller, square hump. Furthermore, the plains bison has been suggested to consist of a northern (B. b. montanae) and a southern subspecies, bringing the total to three. However, this is generally not supported. The wood bison is one of the largest wild species of bovid in the world, surpassed by only the Asian gaur and wild water buffalo. It is the largest extant land animal in the Americas.
The grizzly bear, less commonly known as the silvertip bear, is a large subspecies of brown bear inhabiting North America.
The grizzly bear is, by nature, a long-living animal. The average lifespan for a male is estimated at 22 years, with that of a female being slightly longer at 26. Females live longer than males due to their less dangerous life; avoiding the seasonal breeding fights in which males engage. The oldest wild inland grizzly was 34 years old in Alaska; the oldest coastal bear was 39, but most grizzlies die in their first few years of life from predation or hunting. Captive grizzlies have lived as long as 44 years.
Grizzlies are considered more aggressive compared to black bears when defending themselves and their offspring. Unlike the smaller black bears, adult grizzlies do not climb trees well and respond to danger by standing their ground and warding off their attackers. Mothers defending cubs are the most prone to attacking, and are responsible for 70% of humans killed by grizzlies.
A sign at a BC Park warns campers to hang food, garbage, and toiletries out of reach of bears, or to use a secure bear cache.
Grizzly bears normally avoid contact with people. In spite of their obvious physical advantage they rarely actively hunt humans. Most grizzly bear attacks result from a bear that has been surprised at very close range, especially if it has a supply of food to protect, or female grizzlies protecting their offspring.
Increased human–bear interaction has created "problem bears": bears adapted to human activities or habitat. Aversive conditioning using rubber bullets, foul-tasting chemicals, or acoustic deterrent devices attempt to condition bears to associate humans with unpleasantness, but is ineffectual when bears have already learned to positively associate humans with food. Such bears are translocated or killed because they pose a threat to humans. The B.C. government kills approximately 50 problem bears each year and overall spends more than one million dollars annually to address bear complaints, relocate bears and kill them.
Grizzly bears are especially dangerous because of the force of their bite, which has been measured at over 8 megapascals (1160 psi). It has been estimated that a bite from a grizzly could even crush a bowling ball.
All information according to www.wikipedia.org
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