Bark beetle : A small beetle of many species (family Scolytidae), which in the larval state bores under or in the bark of trees, often doing great damage.

Example:


Taxonomy
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Defination from the web:
bark beetle is one of approximately 220 genera with 6,000 species of beetles in the subfamily Scolytinae. ... be left alone and that natural processes be allowed to take their course, even if it meant that the bark beetle would destroy most of the forest. ...