Ted Kerasote introduces the setting in the first paragraph of his essay. He describes the scene to the reader, that the action is taking place in the Northeastern corner of Yellowstone Park in the hills above Soda Bottle Creek. He describes that it's an isolated area, if you left one road you would not come across another one for quite some time.
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The figurative language would be “..that nipped him sharply and bit with especial venom”
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The sensory details used to convey images in this excerpt are mainly to do with the grape vines and also the flowers. The grape vines are depicted as "brawny ropes of brown" which conjures up an image of thick strong sinews which spread all over the porch and around the windows and form frames around the windows in "thick bowers" and the flowers in "riotous glory" exhibit wonderful colours and with pleasing textures like the velvety nasturtiums.