Chicken wire and posts make a barrier to keep porcupines from chewing on vital hoses and lines under cars in Bugaboo Provincial Park, British Columbia, Canada. The Bugaboos are a range in the Purcell Mountains, which are a subrange of the Columbia Mountains, which are west of the Rocky Mountain Trench. (Some USA maps label the “Percell Mountains” where their southern limit protrudes into the states of Idaho and Montana.) The igneous Bugaboo intrusion of 135 million years ago cooled into hard crystalline granite and was scraped into spires by glaciers eroding surrounding rock dating from 600 million to 1 billion years ago.
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