What type of small, green worms hang on silk threads? A reader recently sent us this question after observing some worms “floating” outdoors (and, to be fair, small worms that hang on thin threads of silk often do look like they are floating around). They didn’t mention where they found the worms, but since the reader seems to be describing inchworms (sometimes written as “inch worms”), there is a good chance they were hanging from oak trees. So, what exactly is an inchworm, and why do we think this is the creature our reader found?