Grizzly Bears in North America
Introduction
The Grizzly bear (Ursus arctos) has long been considered to be the symbol of the wild. They are beautiful, powerful and at the same time vulnerable animals. They are known to survive in remote areas not inhabited by humans. The Grizzly was once able to occupy most of the land from northern Mexico to Alaska and most places in between. With a disappearing natural habitat and one of the lowest reproduction rate of any mammal in North America the Grizzly bear has seen population number fall dramatically. Most Grizzly bears left in the continental United States are located in four states near Yellowstone National Park. Canada has Grizzly populations in five provinces. The state of Alaska has the largest population of these amazing animals. With change in habitat due to human involvement and low reproduction rates, Grizzly bears have had a hard time sustaining population numbers. This has caused them to virtually become non-existent in certain areas of North America and is forcing the bears that are left to move to more sufficient areas that can sustain their populations.
Classification
Grizzly bears are classified using a taxonomic hierarchy as are most living things in this world. The classified is by this hierarchy class, order, family, genus, species, and subspecies. The classification of the bears is as follows: Mammalia, Carnivora, Ursidae, Ursus, and Arctos. The Mammalia class includes warm blooded animals with hair to regulate body temperature. The Carnivora class includes animals that eat meat and have large sharp teeth. Ursidae is a small group of 8 species which are all bears. Ursus Arctos is the scientific name for the brown bear of North America.
Appearance
The Grizzly...
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...naturescience/bearrecovery.htm -yellowstone pops (good introduction)
8. http://www.bearbiology.com/fileadmin/tpl/Downloads/URSUS/Vol_9/Banci_Demarchi_Archibald_Vol_9.pdf - population and good map of north America
9. http://www.env.gov.bc.ca/wld/documents/grzzlybear.pdf -Population Location
10. http://animals.pawnation.com/many-grizzly-bears-there-america-1733.html - what states found in
11. http://www.pbs.org/wnet/nature/episodes/bears-of-the-last-frontier/hour-one-city-of-bears/brown-bear-fact-sheet/6522/ - range in America
12. http://www.env.gov.bc.ca/wld/documents/grzzlybear.pdf - Alaska population and Canadian population
13. http://www.nps.gov/yell/naturescience/grizzlyup.htm - GYA population numbers
14. http://visityellowstonenationalparkyall.weebly.com/ - biome habitat
15. http://www.fws.gov/mountain-prairie/species/mammals/grizzly/ - conservation/protection
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The controversy over logging, and more specifically clearcutting, is not a new issue in America. Ever since the 1920's and 1930's, when this nation started to become conscious of conservation, citizens have weighed the consequences of logging. Critics have questioned whether the increase in jobs, tax dollars, and economic growth was worth the destruction of forest lands. Regardless of what they believe today, the logging industry had become so efficient that by the late 1980's nearly 100,000 acres of federal land had been clearcut since the industry began. Logging technology has advanced rapidly in terms of speed, to meet the increasing demands for lumber, paper, and other products derived from trees. This in turn has greatly impacted the environment by severely degrading watersheds, leading to increased soil erosion, the diminution in the quality of drinking water, and the decline of fish stocks, among many other consequences. In this essay I will examine the progression of logging equipment throughout the 19th and 20th centuries and discuss how these changes in technology have not only changed the relationship of those who work in the industry, but also haw this has changed the wider relationship of society and nature.
Species are decreasing and becoming extinct over time due to climate warming. Animals and plants have developed and diversified from earlier forms to become more complex organisms. Not only have living organisms changed, but so has the Earth. Over time, the world itself has changed drastically, not just the climate but the way it looks as well. The ice on the arctic is melting, causing oceans to become more acidic, oceans became deserts and pollution from our everyday lives are affecting the ozone. It all adds up and changes the world negatively. When the world changes, so do the animals within it. Climate warming has been a big part of the change we see in the population of different species. The speed of climate change is excelling, which
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