Caption
Saw dust (frass) at base of Lodgepole Pine tree trunk where Mountain pine beetles (Dendroctonus ponderosae) have drilled through the bark.Resin / pitch indicate the beetles' entry holes. Grand Teton National Park, Wyoming, USA, August. The current outbreak of mountain pine beetles has been particularly aggressive. This is due to climate change, monoculture planting of trees and fire suppression.
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