Pictures: Tent Caterpillars
If you've been outside lately, you've probably noticed thick, white, web-like nests in the crooks of trees. These are made by the Eastern Tent Caterpillar. These little guys hatch in early spring and quickly get to work building their nests. They spend the hottest time of the day in their "tents", coming out in the morning and evening to feast on the new leaves that are popping out this time of year.
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They may seem destructive, but Tent Caterpillars are no real threat to healthy trees.