Aspects of this topic are discussed in the following places at Britannica.
The fall webworm (Hyphantria cunea) is a serious pest whose caterpillars construct webs over the leaves at the end of branches. Sometimes large areas are covered with silken sheets. They pupate above ground in cocoons made of larval hairs and silk. These silken webs can be distinguished from those of the tent caterpillars, as the latter construct silken retreats in branch forks deep...
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