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Photo: John F. Russell
Andy Cadenhead, who works for the U.S. Forest Service, takes the bark off a dying pine tree on Rabbit Ears Pass to look for the mountain pine beetle. Cadenhead said dying trees still may look healthy, but on the outside, small flows of hardened sap are a good indication that beetles are present. Cadenhead said the tree exudes the sap in an attempt to push the beetles out — the tree's only defense against the insect.
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