A reader in the San Francisco Bay area reported that on a recent morning her house was “covered” with “thousands” of worms or larvae. They were on the wood paneling of the house’s exterior, essentially enveloping entire walls. After applying what we can only imagine was a massive dose insecticide, the reader managed to kill all but three of the creatures on her home. So, the problem was essentially taken care of by the time she wrote to us, but she was still curious what she found. She said the creatures looked like snails because of their antennae, but we actually think she found slugs (snails without shells) with tentacles for reasons we will detail shortly.