Three standout costumes from the insect world include lacewing larvae known as “junk bugs” (left), bagworm moth caterpillars (middle), and case-building caddisfly larvae. (Photos by [left to right] Judy Gallagher, Flickr, CC BY 2.0; Biswas.rishov, Wikimedia Commons, CC BY-SA 4.0; and Bob Henricks, Flickr, CC BY-SA 2.0)