“Are these worms in this tree and this black stuff on a rock wall?” asks this reader about the mass of organisms pictured below. “It is from Mansfield, Ohio. Thank you for your time!” Based on the photo, this is nothing we think we have encountered before. The black organisms on the rock do not necessarily look like worms to us, and we cannot make out what organisms we are supposed to be looking at on the tree. Upon zooming in on the photo of the rock, it looks like the organisms could possess wings. That said, the photo makes it difficult to see the details of the organisms’ bodies, so this is merely an educated guess. In any case, we think these could be black bean aphids (otherwise known as blackflies). Usually, they are found swarming plants that they suck the sap from.