On a recent hike, we noticed what we thought were spider webs on trees along the trail. Upon further inspection, they each contained a large number of caterpillars. This is new to me so I’ve done some research and there are several species of caterpillars that construct silken shelters or tents. These caterpillars will turn into moths. Some of these species are considered pests due to the damage they inflict on the trees.
Laura Roettiger Books 