Pine bark (center) and other beetles found in a dead Ponderosa pine in Sequoia National Forest are displayed on the inner side of a piece of outer bark that Entomologist Beverly Bulaon removed in search for pine bark beetles burrowed in dead coniferson August 24, 2016. As pine bark beetles and their larvae bore through the bark they leave behind frass, a sawdust-like wood debris seen in the lower right. Drought conditions have weakened the tree’s ability to expel the increased number of these boring beetles. Several types of beetles live in these trees during its natural lifecycle; some are beneficial while beetles such as this can kill the tree. Brown needles and downward limbs easily identify these dead pine trees. USDA Photo by Lance Cheung.