“How do you distinguish oak worms from asp caterpillars?” is all this reader writes in her submission. She does not attach any photographs, but in this case, that’s not necessary. The two creatures she asks about are moth species, and they are actually very different. Sure, they are both defoliators, and eat leaves from the respective trees they are named after, but just appearance-wise, they are night and day, and are very easy to distinguish. So, in essence, our reader made our job really easy for us.