Bob is amazed to learn that tent caterpillars are native. He also learns that pregnant horses can be harmed by tent caterpillars. As usual Bill tells us when are where to find these gregarious creatures. Our sources for this episode include: Interesting Behaviors and Traits of Tent Caterpillars - https://www.thoughtco.com/tent-caterpillar-facts-4148139 7 facts about tent caterpillars and why they're all over N.J. this spring - http://www.nj.com/news/index.ssf/2016/05/6_facts_about_tent_caterpillars.html Eastern Tent Caterpillar - https://entomology.ca.uky.edu/ef423