What are these insects in my yard?
These are probably newly hatched fall webworms. These are a native caterpillar that appears late in the growing season. It makes webs, is a big food source for wildlife, and doesn't usually do enough damage to warrant any treatment. Here's our fact sheet about what to do: http://extension.umd.edu/hgic/fall-webworm-trees Webs disappear over the winter.