These pine beetle larvae trails attest to the damage done to the trees in the forest on the ridge above. The larvae eat the green cambium layer just below the tree bark, quickly killing the tree. The land above the falls is Bowater Paper Company land which had been thickly planted in pines. A monoculture of trees can be seriously affected by an attack of insects or disease. The native beetles go through a cycle every so many years, millions of beetles killing most of the trees in the forests, then suddenly their numbers crash, allowing the surviving trees to grow again.