Evergreen trees at Lake O'Hara, Yoho National Park, B.C.

Evergreen trees at Lake O'Hara, Yoho National Park, B.C.

© R. Ian Lloyd/Masterfile

Evergreen trees at Lake O'Hara, Yoho National Park, B.C.

Evergreen trees at Lake O'Hara, Yoho National Park, B.C.

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