An unusual pattern is left by forest fire as seen in this photograph of a mountain in Yoho National Park in British Columbia west of the Alberta border in this August 8, 2005 file picture. The fire was a controlled burn of forest areas infested with the mountain pine beetle. The pine beetle epidemic has killed millions of trees and affected some seven million hectares of forest in the province. Forestry officials have used controlled burns to kill the beetle and prevent the insect from spreading further. To match feature USA-FORESTS/BEETLE REUTERS/Andy Clark/Files (CANADA ANIMALS ENVIRONMENT)